{
  "schema": "aq26_england_network_review_v3",
  "status": "partial_england_network_review",
  "target_area": "England",
  "period_start": "2026-09-29",
  "period_end": "2026-10-28",
  "period_days": 30,
  "period_end_rule": "latest completed source-calendar day with valid evidence in all 9 English regions",
  "regions_with_valid_data_on_period_end": 9,
  "configured_region_count": 9,
  "regions_reporting": 9,
  "region_coverage_percent": 100.0,
  "active_aurn_sites_discovered": 179,
  "configured_target_pollutant_station_count": 150,
  "reporting_station_count": 141,
  "reporting_station_coverage_percent": 94.0,
  "configured_target_stream_count": 345,
  "expected_configured_stream_days": 10120,
  "valid_pollutant_day_observations": 9736,
  "unique_station_days": 4193,
  "valid_station_days": 9736,
  "configured_stream_day_completeness_percent": 96.2,
  "national_publication_ready": false,
  "coverage_contract": {
    "all_nine_english_regions_required": true,
    "minimum_reporting_station_fraction": 0.85,
    "minimum_configured_stream_day_fraction": 0.85,
    "minimum_region_pollutant_stream_day_fraction": 0.8,
    "minimum_stations_for_regional_comparison": 2,
    "fixed_panel_minimum_valid_days": 27,
    "configured_pollutant_streams_are_the_completeness_denominator": true
  },
  "completeness_scope": "valid pollutant-day observations divided by expected pollutant-day observations for every currently configured NO2, PM10 and PM2.5 stream discovered at active English AURN sites",
  "configured_stream_day_completeness_formula": {
    "numerator_key": "valid_pollutant_day_observations",
    "denominator_key": "expected_configured_stream_days",
    "unit": "pollutant-day observations",
    "formula": "100 × valid pollutant-day observations / expected configured pollutant-day observations"
  },
  "pollutant_coverage": [
    {
      "pollutant": "PM2.5",
      "configured_station_streams": 134,
      "configured_regions": 9,
      "expected_pollutant_day_observations": 3898,
      "expected_station_days": 3898,
      "reporting_stations": 125,
      "reporting_regions": 9,
      "valid_pollutant_day_observations": 3702,
      "valid_station_days": 3702,
      "configured_stream_day_completeness_percent": 95.0,
      "all_configured_regions_reporting": true,
      "coverage_status": "reporting"
    },
    {
      "pollutant": "PM10",
      "configured_station_streams": 115,
      "configured_regions": 9,
      "expected_pollutant_day_observations": 3342,
      "expected_station_days": 3342,
      "reporting_stations": 107,
      "reporting_regions": 9,
      "valid_pollutant_day_observations": 3177,
      "valid_station_days": 3177,
      "configured_stream_day_completeness_percent": 95.1,
      "all_configured_regions_reporting": true,
      "coverage_status": "reporting"
    },
    {
      "pollutant": "NO2",
      "configured_station_streams": 96,
      "configured_regions": 9,
      "expected_pollutant_day_observations": 2880,
      "expected_station_days": 2880,
      "reporting_stations": 96,
      "reporting_regions": 9,
      "valid_pollutant_day_observations": 2857,
      "valid_station_days": 2857,
      "configured_stream_day_completeness_percent": 99.2,
      "all_configured_regions_reporting": true,
      "coverage_status": "reporting"
    }
  ],
  "region_pollutant_coverage": [
    {
      "region": "North East",
      "pollutant": "PM2.5",
      "expected_pollutant_day_observations": 360,
      "expected_station_days": 360,
      "valid_pollutant_day_observations": 358,
      "valid_station_days": 358,
      "reporting_stations": 12,
      "completeness_percent": 99.4,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "North East",
      "pollutant": "PM10",
      "expected_pollutant_day_observations": 300,
      "expected_station_days": 300,
      "valid_pollutant_day_observations": 298,
      "valid_station_days": 298,
      "reporting_stations": 10,
      "completeness_percent": 99.3,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "North East",
      "pollutant": "NO2",
      "expected_pollutant_day_observations": 240,
      "expected_station_days": 240,
      "valid_pollutant_day_observations": 240,
      "valid_station_days": 240,
      "reporting_stations": 8,
      "completeness_percent": 100.0,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "North West",
      "pollutant": "PM2.5",
      "expected_pollutant_day_observations": 571,
      "expected_station_days": 571,
      "valid_pollutant_day_observations": 529,
      "valid_station_days": 529,
      "reporting_stations": 18,
      "completeness_percent": 92.6,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "North West",
      "pollutant": "PM10",
      "expected_pollutant_day_observations": 495,
      "expected_station_days": 495,
      "valid_pollutant_day_observations": 477,
      "valid_station_days": 477,
      "reporting_stations": 16,
      "completeness_percent": 96.4,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "North West",
      "pollutant": "NO2",
      "expected_pollutant_day_observations": 510,
      "expected_station_days": 510,
      "valid_pollutant_day_observations": 507,
      "valid_station_days": 507,
      "reporting_stations": 17,
      "completeness_percent": 99.4,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "expected_pollutant_day_observations": 572,
      "expected_station_days": 572,
      "valid_pollutant_day_observations": 567,
      "valid_station_days": 567,
      "reporting_stations": 19,
      "completeness_percent": 99.1,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "expected_pollutant_day_observations": 512,
      "expected_station_days": 512,
      "valid_pollutant_day_observations": 507,
      "valid_station_days": 507,
      "reporting_stations": 17,
      "completeness_percent": 99.0,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "expected_pollutant_day_observations": 450,
      "expected_station_days": 450,
      "valid_pollutant_day_observations": 443,
      "valid_station_days": 443,
      "reporting_stations": 15,
      "completeness_percent": 98.4,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "expected_pollutant_day_observations": 407,
      "expected_station_days": 407,
      "valid_pollutant_day_observations": 385,
      "valid_station_days": 385,
      "reporting_stations": 13,
      "completeness_percent": 94.6,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "East Midlands",
      "pollutant": "PM10",
      "expected_pollutant_day_observations": 347,
      "expected_station_days": 347,
      "valid_pollutant_day_observations": 330,
      "valid_station_days": 330,
      "reporting_stations": 11,
      "completeness_percent": 95.1,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "East Midlands",
      "pollutant": "NO2",
      "expected_pollutant_day_observations": 270,
      "expected_station_days": 270,
      "valid_pollutant_day_observations": 269,
      "valid_station_days": 269,
      "reporting_stations": 9,
      "completeness_percent": 99.6,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "expected_pollutant_day_observations": 570,
      "expected_station_days": 570,
      "valid_pollutant_day_observations": 549,
      "valid_station_days": 549,
      "reporting_stations": 19,
      "completeness_percent": 96.3,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "West Midlands",
      "pollutant": "PM10",
      "expected_pollutant_day_observations": 540,
      "expected_station_days": 540,
      "valid_pollutant_day_observations": 519,
      "valid_station_days": 519,
      "reporting_stations": 18,
      "completeness_percent": 96.1,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "West Midlands",
      "pollutant": "NO2",
      "expected_pollutant_day_observations": 480,
      "expected_station_days": 480,
      "valid_pollutant_day_observations": 470,
      "valid_station_days": 470,
      "reporting_stations": 16,
      "completeness_percent": 97.9,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "East of England",
      "pollutant": "PM2.5",
      "expected_pollutant_day_observations": 224,
      "expected_station_days": 224,
      "valid_pollutant_day_observations": 150,
      "valid_station_days": 150,
      "reporting_stations": 5,
      "completeness_percent": 67.0,
      "meets_minimum_cell_floor": false,
      "meets_national_stream_threshold": false,
      "coverage_status": "below_minimum_floor"
    },
    {
      "region": "East of England",
      "pollutant": "PM10",
      "expected_pollutant_day_observations": 164,
      "expected_station_days": 164,
      "valid_pollutant_day_observations": 120,
      "valid_station_days": 120,
      "reporting_stations": 4,
      "completeness_percent": 73.2,
      "meets_minimum_cell_floor": false,
      "meets_national_stream_threshold": false,
      "coverage_status": "below_minimum_floor"
    },
    {
      "region": "East of England",
      "pollutant": "NO2",
      "expected_pollutant_day_observations": 120,
      "expected_station_days": 120,
      "valid_pollutant_day_observations": 120,
      "valid_station_days": 120,
      "reporting_stations": 4,
      "completeness_percent": 100.0,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "London",
      "pollutant": "PM2.5",
      "expected_pollutant_day_observations": 210,
      "expected_station_days": 210,
      "valid_pollutant_day_observations": 208,
      "valid_station_days": 208,
      "reporting_stations": 7,
      "completeness_percent": 99.0,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "London",
      "pollutant": "PM10",
      "expected_pollutant_day_observations": 180,
      "expected_station_days": 180,
      "valid_pollutant_day_observations": 148,
      "valid_station_days": 148,
      "reporting_stations": 5,
      "completeness_percent": 82.2,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": false,
      "coverage_status": "meets_minimum_floor_with_exception"
    },
    {
      "region": "London",
      "pollutant": "NO2",
      "expected_pollutant_day_observations": 120,
      "expected_station_days": 120,
      "valid_pollutant_day_observations": 120,
      "valid_station_days": 120,
      "reporting_stations": 4,
      "completeness_percent": 100.0,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "South East",
      "pollutant": "PM2.5",
      "expected_pollutant_day_observations": 564,
      "expected_station_days": 564,
      "valid_pollutant_day_observations": 540,
      "valid_station_days": 540,
      "reporting_stations": 18,
      "completeness_percent": 95.7,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "South East",
      "pollutant": "PM10",
      "expected_pollutant_day_observations": 504,
      "expected_station_days": 504,
      "valid_pollutant_day_observations": 480,
      "valid_station_days": 480,
      "reporting_stations": 16,
      "completeness_percent": 95.2,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "South East",
      "pollutant": "NO2",
      "expected_pollutant_day_observations": 390,
      "expected_station_days": 390,
      "valid_pollutant_day_observations": 388,
      "valid_station_days": 388,
      "reporting_stations": 13,
      "completeness_percent": 99.5,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "South West",
      "pollutant": "PM2.5",
      "expected_pollutant_day_observations": 420,
      "expected_station_days": 420,
      "valid_pollutant_day_observations": 416,
      "valid_station_days": 416,
      "reporting_stations": 14,
      "completeness_percent": 99.0,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "South West",
      "pollutant": "PM10",
      "expected_pollutant_day_observations": 300,
      "expected_station_days": 300,
      "valid_pollutant_day_observations": 298,
      "valid_station_days": 298,
      "reporting_stations": 10,
      "completeness_percent": 99.3,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "South West",
      "pollutant": "NO2",
      "expected_pollutant_day_observations": 300,
      "expected_station_days": 300,
      "valid_pollutant_day_observations": 300,
      "valid_station_days": 300,
      "reporting_stations": 10,
      "completeness_percent": 100.0,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    }
  ],
  "regional_coverage_exceptions": [
    {
      "region": "London",
      "pollutant": "PM10",
      "expected_pollutant_day_observations": 180,
      "expected_station_days": 180,
      "valid_pollutant_day_observations": 148,
      "valid_station_days": 148,
      "reporting_stations": 5,
      "completeness_percent": 82.2,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": false,
      "coverage_status": "meets_minimum_floor_with_exception"
    }
  ],
  "availability": [
    {
      "region": "North East",
      "active_aurn_sites_discovered": 13,
      "configured_target_pollutant_sites": 12,
      "reporting_stations": 12,
      "pollutants_with_valid_daily_means": [
        "NO2",
        "PM10",
        "PM2.5"
      ],
      "valid_pollutant_day_observations": 896,
      "valid_station_days": 896,
      "coverage_status": "reporting"
    },
    {
      "region": "North West",
      "active_aurn_sites_discovered": 26,
      "configured_target_pollutant_sites": 25,
      "reporting_stations": 23,
      "pollutants_with_valid_daily_means": [
        "NO2",
        "PM10",
        "PM2.5"
      ],
      "valid_pollutant_day_observations": 1513,
      "valid_station_days": 1513,
      "coverage_status": "reporting"
    },
    {
      "region": "Yorkshire and the Humber",
      "active_aurn_sites_discovered": 22,
      "configured_target_pollutant_sites": 21,
      "reporting_stations": 20,
      "pollutants_with_valid_daily_means": [
        "NO2",
        "PM10",
        "PM2.5"
      ],
      "valid_pollutant_day_observations": 1517,
      "valid_station_days": 1517,
      "coverage_status": "reporting"
    },
    {
      "region": "East Midlands",
      "active_aurn_sites_discovered": 18,
      "configured_target_pollutant_sites": 15,
      "reporting_stations": 14,
      "pollutants_with_valid_daily_means": [
        "NO2",
        "PM10",
        "PM2.5"
      ],
      "valid_pollutant_day_observations": 984,
      "valid_station_days": 984,
      "coverage_status": "reporting"
    },
    {
      "region": "West Midlands",
      "active_aurn_sites_discovered": 22,
      "configured_target_pollutant_sites": 22,
      "reporting_stations": 22,
      "pollutants_with_valid_daily_means": [
        "NO2",
        "PM10",
        "PM2.5"
      ],
      "valid_pollutant_day_observations": 1538,
      "valid_station_days": 1538,
      "coverage_status": "reporting"
    },
    {
      "region": "East of England",
      "active_aurn_sites_discovered": 16,
      "configured_target_pollutant_sites": 9,
      "reporting_stations": 6,
      "pollutants_with_valid_daily_means": [
        "NO2",
        "PM10",
        "PM2.5"
      ],
      "valid_pollutant_day_observations": 390,
      "valid_station_days": 390,
      "coverage_status": "reporting"
    },
    {
      "region": "London",
      "active_aurn_sites_discovered": 17,
      "configured_target_pollutant_sites": 7,
      "reporting_stations": 7,
      "pollutants_with_valid_daily_means": [
        "NO2",
        "PM10",
        "PM2.5"
      ],
      "valid_pollutant_day_observations": 476,
      "valid_station_days": 476,
      "coverage_status": "reporting"
    },
    {
      "region": "South East",
      "active_aurn_sites_discovered": 26,
      "configured_target_pollutant_sites": 22,
      "reporting_stations": 20,
      "pollutants_with_valid_daily_means": [
        "NO2",
        "PM10",
        "PM2.5"
      ],
      "valid_pollutant_day_observations": 1408,
      "valid_station_days": 1408,
      "coverage_status": "reporting"
    },
    {
      "region": "South West",
      "active_aurn_sites_discovered": 19,
      "configured_target_pollutant_sites": 17,
      "reporting_stations": 17,
      "pollutants_with_valid_daily_means": [
        "NO2",
        "PM10",
        "PM2.5"
      ],
      "valid_pollutant_day_observations": 1014,
      "valid_station_days": 1014,
      "coverage_status": "reporting"
    }
  ],
  "station_statistics": [
    {
      "region": "East Midlands",
      "station_code": "CHLG",
      "uka_id": "UKA00604",
      "station_name": "Chesterfield Loundsley Green",
      "environment_type": "Urban Background",
      "pollutant": "NO2",
      "valid_days": 29,
      "ratified_days": 0,
      "provisional_or_as_supplied_days": 29,
      "period_stat_eligible": true,
      "fixed_panel_eligible": true,
      "period_mean_ug_m3": 6.44,
      "period_median_ug_m3": 6.06,
      "period_p95_daily_mean_ug_m3": 11.61,
      "max_daily_mean_ug_m3": 11.99,
      "days_above_who_reference": 0
    },
    {
      "region": "East Midlands",
      "station_code": "CHLG",
      "uka_id": "UKA00604",
      "station_name": "Chesterfield Loundsley Green",
      "environment_type": "Urban Background",
      "pollutant": "PM10",
      "valid_days": 30,
      "ratified_days": 0,
      "provisional_or_as_supplied_days": 30,
      "period_stat_eligible": true,
      "fixed_panel_eligible": true,
      "period_mean_ug_m3": 8.1,
      "period_median_ug_m3": 7.55,
      "period_p95_daily_mean_ug_m3": 13.76,
      "max_daily_mean_ug_m3": 16.63,
      "days_above_who_reference": 0
    },
    {
      "region": "East Midlands",
      "station_code": "CHLG",
      "uka_id": "UKA00604",
      "station_name": "Chesterfield Loundsley Green",
      "environment_type": "Urban Background",
      "pollutant": "PM2.5",
      "valid_days": 30,
      "ratified_days": 0,
      "provisional_or_as_supplied_days": 30,
      "period_stat_eligible": true,
      "fixed_panel_eligible": true,
      "period_mean_ug_m3": 4.35,
      "period_median_ug_m3": 3.89,
      "period_p95_daily_mean_ug_m3": 7.98,
      "max_daily_mean_ug_m3": 11.05,
      "days_above_who_reference": 0
    },
    {
      "region": "East Midlands",
      "station_code": "CHS7",
      "uka_id": "UKA00529",
      "station_name": "Chesterfield Roadside",
      "environment_type": "Urban Traffic",
      "pollutant": "NO2",
      "valid_days": 30,
      "ratified_days": 0,
      "provisional_or_as_supplied_days": 30,
      "period_stat_eligible": true,
      "fixed_panel_eligible": true,
      "period_mean_ug_m3": 11.45,
      "period_median_ug_m3": 10.89,
      "period_p95_daily_mean_ug_m3": 19.72,
      "max_daily_mean_ug_m3": 21.92,
      "days_above_who_reference": 0
    },
    {
      "region": "East Midlands",
      "station_code": "CHS7",
      "uka_id": "UKA00529",
      "station_name": "Chesterfield Roadside",
      "environment_type": "Urban Traffic",
      "pollutant": "PM10",
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      "regional_comparison_eligible": true,
      "representativeness_note": "multi-station regional descriptive summary"
    },
    {
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
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      "median_daily_mean_ug_m3": 4.97,
      "p95_daily_mean_ug_m3": 10.11,
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      "median_contributing_stations": 19.0,
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      "representativeness_note": "multi-station regional descriptive summary"
    }
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      "region": "East Midlands",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 11.09,
      "regional_daily_mean_ug_m3": 13.22,
      "contributing_stations": 9,
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      "date": "2026-09-29",
      "region": "East Midlands",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 15.99,
      "regional_daily_mean_ug_m3": 16.3,
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      "regional_comparison_eligible": true
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      "region": "East Midlands",
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      "regional_daily_mean_ug_m3": 10.04,
      "contributing_stations": 13,
      "regional_comparison_eligible": true
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      "region": "East of England",
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      "regional_comparison_eligible": true
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      "region": "East of England",
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      "regional_daily_median_ug_m3": 23.64,
      "regional_daily_mean_ug_m3": 25.02,
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      "regional_comparison_eligible": true
    },
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      "region": "East of England",
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      "regional_daily_mean_ug_m3": 16.79,
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      "regional_comparison_eligible": true
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      "date": "2026-09-29",
      "region": "London",
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      "regional_daily_mean_ug_m3": 22.62,
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      "region": "London",
      "pollutant": "PM10",
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      "regional_daily_mean_ug_m3": 19.33,
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      "region": "London",
      "pollutant": "PM2.5",
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      "regional_daily_mean_ug_m3": 12.1,
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      "region": "North East",
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      "region": "North East",
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      "regional_daily_mean_ug_m3": 15.44,
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      "region": "North East",
      "pollutant": "PM2.5",
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      "regional_daily_mean_ug_m3": 9.15,
      "contributing_stations": 12,
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      "date": "2026-09-29",
      "region": "North West",
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      "contributing_stations": 17,
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      "date": "2026-09-29",
      "region": "North West",
      "pollutant": "PM10",
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      "regional_daily_mean_ug_m3": 12.75,
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      "region": "North West",
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      "regional_daily_mean_ug_m3": 7.31,
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      "region": "South East",
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      "date": "2026-09-29",
      "region": "South East",
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      "regional_daily_mean_ug_m3": 19.14,
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      "date": "2026-09-29",
      "region": "South East",
      "pollutant": "PM2.5",
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      "regional_daily_mean_ug_m3": 10.97,
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      "date": "2026-09-29",
      "region": "South West",
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      "regional_daily_median_ug_m3": 11.78,
      "regional_daily_mean_ug_m3": 11.81,
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      "date": "2026-09-29",
      "region": "South West",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 15.86,
      "regional_daily_mean_ug_m3": 16.17,
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      "date": "2026-09-29",
      "region": "South West",
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      "regional_daily_mean_ug_m3": 8.28,
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      "date": "2026-09-29",
      "region": "West Midlands",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 11.42,
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      "regional_comparison_eligible": true
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      "date": "2026-09-29",
      "region": "West Midlands",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 13.62,
      "regional_daily_mean_ug_m3": 13.9,
      "contributing_stations": 18,
      "regional_comparison_eligible": true
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      "date": "2026-09-29",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 7.91,
      "regional_daily_mean_ug_m3": 8.03,
      "contributing_stations": 19,
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      "date": "2026-09-29",
      "region": "Yorkshire and the Humber",
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      "regional_daily_median_ug_m3": 16.26,
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      "date": "2026-09-29",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 18.96,
      "regional_daily_mean_ug_m3": 19.75,
      "contributing_stations": 17,
      "regional_comparison_eligible": true
    },
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      "date": "2026-09-29",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 10.27,
      "regional_daily_mean_ug_m3": 10.97,
      "contributing_stations": 19,
      "regional_comparison_eligible": true
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      "date": "2026-09-30",
      "region": "East Midlands",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 13.2,
      "regional_daily_mean_ug_m3": 15.5,
      "contributing_stations": 9,
      "regional_comparison_eligible": true
    },
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      "date": "2026-09-30",
      "region": "East Midlands",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 14.0,
      "regional_daily_mean_ug_m3": 14.02,
      "contributing_stations": 11,
      "regional_comparison_eligible": true
    },
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      "date": "2026-09-30",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 7.35,
      "regional_daily_mean_ug_m3": 7.57,
      "contributing_stations": 13,
      "regional_comparison_eligible": true
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      "date": "2026-09-30",
      "region": "East of England",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 12.22,
      "regional_daily_mean_ug_m3": 14.24,
      "contributing_stations": 4,
      "regional_comparison_eligible": true
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      "date": "2026-09-30",
      "region": "East of England",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 15.02,
      "regional_daily_mean_ug_m3": 14.96,
      "contributing_stations": 4,
      "regional_comparison_eligible": true
    },
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      "date": "2026-09-30",
      "region": "East of England",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 6.66,
      "regional_daily_mean_ug_m3": 7.21,
      "contributing_stations": 5,
      "regional_comparison_eligible": true
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      "date": "2026-09-30",
      "region": "London",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 17.54,
      "regional_daily_mean_ug_m3": 19.13,
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      "regional_comparison_eligible": true
    },
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      "date": "2026-09-30",
      "region": "London",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 13.19,
      "regional_daily_mean_ug_m3": 14.58,
      "contributing_stations": 5,
      "regional_comparison_eligible": true
    },
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      "date": "2026-09-30",
      "region": "London",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 6.39,
      "regional_daily_mean_ug_m3": 6.39,
      "contributing_stations": 7,
      "regional_comparison_eligible": true
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      "date": "2026-09-30",
      "region": "North East",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 10.87,
      "regional_daily_mean_ug_m3": 14.94,
      "contributing_stations": 8,
      "regional_comparison_eligible": true
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      "date": "2026-09-30",
      "region": "North East",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 16.88,
      "regional_daily_mean_ug_m3": 17.07,
      "contributing_stations": 10,
      "regional_comparison_eligible": true
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      "date": "2026-09-30",
      "region": "North East",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 11.14,
      "regional_daily_mean_ug_m3": 11.04,
      "contributing_stations": 12,
      "regional_comparison_eligible": true
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      "date": "2026-09-30",
      "region": "North West",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 12.0,
      "regional_daily_mean_ug_m3": 12.54,
      "contributing_stations": 17,
      "regional_comparison_eligible": true
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      "date": "2026-09-30",
      "region": "North West",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 9.59,
      "regional_daily_mean_ug_m3": 10.28,
      "contributing_stations": 16,
      "regional_comparison_eligible": true
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      "date": "2026-09-30",
      "region": "North West",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 5.19,
      "regional_daily_mean_ug_m3": 5.88,
      "contributing_stations": 18,
      "regional_comparison_eligible": true
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      "date": "2026-09-30",
      "region": "South East",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 13.15,
      "regional_daily_mean_ug_m3": 12.44,
      "contributing_stations": 12,
      "regional_comparison_eligible": true
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    {
      "date": "2026-09-30",
      "region": "South East",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 13.46,
      "regional_daily_mean_ug_m3": 14.29,
      "contributing_stations": 16,
      "regional_comparison_eligible": true
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      "date": "2026-09-30",
      "region": "South East",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 6.15,
      "regional_daily_mean_ug_m3": 6.29,
      "contributing_stations": 18,
      "regional_comparison_eligible": true
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      "date": "2026-09-30",
      "region": "South West",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 8.51,
      "regional_daily_mean_ug_m3": 8.84,
      "contributing_stations": 10,
      "regional_comparison_eligible": true
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    {
      "date": "2026-09-30",
      "region": "South West",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 13.2,
      "regional_daily_mean_ug_m3": 14.12,
      "contributing_stations": 10,
      "regional_comparison_eligible": true
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      "date": "2026-09-30",
      "region": "South West",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 6.14,
      "regional_daily_mean_ug_m3": 6.16,
      "contributing_stations": 14,
      "regional_comparison_eligible": true
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      "date": "2026-09-30",
      "region": "West Midlands",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 9.32,
      "regional_daily_mean_ug_m3": 11.58,
      "contributing_stations": 15,
      "regional_comparison_eligible": true
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    {
      "date": "2026-09-30",
      "region": "West Midlands",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 10.72,
      "regional_daily_mean_ug_m3": 11.36,
      "contributing_stations": 18,
      "regional_comparison_eligible": true
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      "date": "2026-09-30",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 5.62,
      "regional_daily_mean_ug_m3": 5.68,
      "contributing_stations": 19,
      "regional_comparison_eligible": true
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      "date": "2026-09-30",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 20.58,
      "regional_daily_mean_ug_m3": 19.72,
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      "regional_comparison_eligible": true
    },
    {
      "date": "2026-09-30",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 17.68,
      "regional_daily_mean_ug_m3": 18.5,
      "contributing_stations": 17,
      "regional_comparison_eligible": true
    },
    {
      "date": "2026-09-30",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 11.17,
      "regional_daily_mean_ug_m3": 11.21,
      "contributing_stations": 19,
      "regional_comparison_eligible": true
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      "date": "2026-10-01",
      "region": "East Midlands",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 19.68,
      "regional_daily_mean_ug_m3": 21.03,
      "contributing_stations": 8,
      "regional_comparison_eligible": true
    },
    {
      "date": "2026-10-01",
      "region": "East Midlands",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 8.66,
      "regional_daily_mean_ug_m3": 8.93,
      "contributing_stations": 11,
      "regional_comparison_eligible": true
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      "date": "2026-10-01",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 4.18,
      "regional_daily_mean_ug_m3": 4.55,
      "contributing_stations": 13,
      "regional_comparison_eligible": true
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      "date": "2026-10-01",
      "region": "East of England",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 15.83,
      "regional_daily_mean_ug_m3": 16.32,
      "contributing_stations": 4,
      "regional_comparison_eligible": true
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      "date": "2026-10-01",
      "region": "East of England",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 8.91,
      "regional_daily_mean_ug_m3": 8.65,
      "contributing_stations": 4,
      "regional_comparison_eligible": true
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      "date": "2026-10-01",
      "region": "East of England",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 4.3,
      "regional_daily_mean_ug_m3": 4.24,
      "contributing_stations": 5,
      "regional_comparison_eligible": true
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      "date": "2026-10-01",
      "region": "London",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 17.87,
      "regional_daily_mean_ug_m3": 18.65,
      "contributing_stations": 4,
      "regional_comparison_eligible": true
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      "date": "2026-10-01",
      "region": "London",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 9.37,
      "regional_daily_mean_ug_m3": 10.41,
      "contributing_stations": 4,
      "regional_comparison_eligible": true
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      "date": "2026-10-01",
      "region": "London",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 4.46,
      "regional_daily_mean_ug_m3": 4.47,
      "contributing_stations": 6,
      "regional_comparison_eligible": true
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      "date": "2026-10-01",
      "region": "North East",
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      "regional_daily_median_ug_m3": 10.76,
      "regional_daily_mean_ug_m3": 14.08,
      "contributing_stations": 8,
      "regional_comparison_eligible": true
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      "date": "2026-10-01",
      "region": "North East",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 10.98,
      "regional_daily_mean_ug_m3": 11.74,
      "contributing_stations": 10,
      "regional_comparison_eligible": true
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      "date": "2026-10-01",
      "region": "North East",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 4.87,
      "regional_daily_mean_ug_m3": 5.12,
      "contributing_stations": 12,
      "regional_comparison_eligible": true
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      "region": "North West",
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      "regional_daily_mean_ug_m3": 14.29,
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      "region": "North West",
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      "regional_daily_median_ug_m3": 12.31,
      "regional_daily_mean_ug_m3": 12.07,
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      "region": "North West",
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      "regional_daily_mean_ug_m3": 5.7,
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      "region": "South East",
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      "regional_daily_median_ug_m3": 16.04,
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      "region": "South East",
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      "regional_daily_median_ug_m3": 9.63,
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      "region": "South East",
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      "date": "2026-09-29",
      "pollutant": "NO2",
      "national_station_median_ug_m3": 12.45,
      "national_station_mean_ug_m3": 14.7,
      "reporting_stations": 95,
      "reporting_regions": 9,
      "station_days_above_who_reference": 8
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      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "PRES",
      "uka_id": "UKA00408",
      "region": "North West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "PRES",
      "uka_id": "UKA00408",
      "region": "North West",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "PRES",
      "uka_id": "UKA00408",
      "region": "North West",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "ROCB",
      "uka_id": "UKA01174",
      "region": "North West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "ROCB",
      "uka_id": "UKA01174",
      "region": "North West",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "ECCL",
      "uka_id": "UKA00339",
      "region": "North West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "ECCL",
      "uka_id": "UKA00339",
      "region": "North West",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "ECCL",
      "uka_id": "UKA00339",
      "region": "North West",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "CW",
      "uka_id": "UKA00579",
      "region": "North West",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SHLW",
      "uka_id": "UKA00627",
      "region": "North West",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SHLW",
      "uka_id": "UKA00627",
      "region": "North West",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "TAMM",
      "uka_id": "UKA01099",
      "region": "North West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "WARP",
      "uka_id": "UKA01175",
      "region": "North West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "WARP",
      "uka_id": "UKA01175",
      "region": "North West",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "WARP",
      "uka_id": "UKA01175",
      "region": "North West",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "WATB",
      "uka_id": "UKA01178",
      "region": "North West",
      "pollutant": "PM2.5",
      "active_start": "2026-10-13",
      "period_end": "2026-10-28",
      "expected_station_days": 16
    },
    {
      "station_code": "WSMR",
      "uka_id": "UKA00603",
      "region": "North West",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "WIG5",
      "uka_id": "UKA00482",
      "region": "North West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "WIG5",
      "uka_id": "UKA00482",
      "region": "North West",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "WIG5",
      "uka_id": "UKA00482",
      "region": "North West",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "TRAN",
      "uka_id": "UKA00406",
      "region": "North West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "TRAN",
      "uka_id": "UKA00406",
      "region": "North West",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "TRAN",
      "uka_id": "UKA00406",
      "region": "North West",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BAR3",
      "uka_id": "UKA00353",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BAR3",
      "uka_id": "UKA00353",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BAR3",
      "uka_id": "UKA00353",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BDMA",
      "uka_id": "UKA00611",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BRAS",
      "uka_id": "UKA01090",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BRAS",
      "uka_id": "UKA01090",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BRWP",
      "uka_id": "UKA01161",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BRWP",
      "uka_id": "UKA01161",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "DYAG",
      "uka_id": "UKA00654",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "DYAG",
      "uka_id": "UKA00654",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "DYAG",
      "uka_id": "UKA00654",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "DCST",
      "uka_id": "UKA00612",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "DCST",
      "uka_id": "UKA00612",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "HALT",
      "uka_id": "UKA01183",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-10-27",
      "period_end": "2026-10-28",
      "expected_station_days": 2
    },
    {
      "station_code": "HALT",
      "uka_id": "UKA01183",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-10-27",
      "period_end": "2026-10-28",
      "expected_station_days": 2
    },
    {
      "station_code": "HARW",
      "uka_id": "UKA01093",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "HARW",
      "uka_id": "UKA01093",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "HUL2",
      "uka_id": "UKA00450",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "HUL2",
      "uka_id": "UKA00450",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "HUL2",
      "uka_id": "UKA00450",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "HULR",
      "uka_id": "UKA00600",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "HULR",
      "uka_id": "UKA00600",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "HULR",
      "uka_id": "UKA00600",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "IMGM",
      "uka_id": "UKA00647",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "IMGM",
      "uka_id": "UKA00647",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "IMGM",
      "uka_id": "UKA00647",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LEED",
      "uka_id": "UKA00222",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LEED",
      "uka_id": "UKA00222",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LEED",
      "uka_id": "UKA00222",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LED6",
      "uka_id": "UKA00527",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LED6",
      "uka_id": "UKA00527",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LED6",
      "uka_id": "UKA00527",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "ROED",
      "uka_id": "UKA01054",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "ROED",
      "uka_id": "UKA01054",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SCN2",
      "uka_id": "UKA00381",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SCN2",
      "uka_id": "UKA00381",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SCN2",
      "uka_id": "UKA00381",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SHBR",
      "uka_id": "UKA00622",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SHBR",
      "uka_id": "UKA00622",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SHDG",
      "uka_id": "UKA00575",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SHDG",
      "uka_id": "UKA00575",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SHDG",
      "uka_id": "UKA00575",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SHE",
      "uka_id": "UKA00181",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SHE",
      "uka_id": "UKA00181",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SHE",
      "uka_id": "UKA00181",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "WAKA",
      "uka_id": "UKA01107",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "WAKA",
      "uka_id": "UKA01107",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "YK10",
      "uka_id": "UKA00523",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "YK10",
      "uka_id": "UKA00523",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "YK10",
      "uka_id": "UKA00523",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "YK11",
      "uka_id": "UKA00524",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "YK11",
      "uka_id": "UKA00524",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "YK11",
      "uka_id": "UKA00524",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "CHLG",
      "uka_id": "UKA00604",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "CHLG",
      "uka_id": "UKA00604",
      "region": "East Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "CHLG",
      "uka_id": "UKA00604",
      "region": "East Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "CHS7",
      "uka_id": "UKA00529",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "CHS7",
      "uka_id": "UKA00529",
      "region": "East Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "CHS7",
      "uka_id": "UKA00529",
      "region": "East Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "DESA",
      "uka_id": "UKA00630",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "DESA",
      "uka_id": "UKA00630",
      "region": "East Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "DESB",
      "uka_id": "UKA01027",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "DESB",
      "uka_id": "UKA01027",
      "region": "East Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "GRCO",
      "uka_id": "UKA01182",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-10-12",
      "period_end": "2026-10-28",
      "expected_station_days": 17
    },
    {
      "station_code": "GRCO",
      "uka_id": "UKA01182",
      "region": "East Midlands",
      "pollutant": "PM10",
      "active_start": "2026-10-12",
      "period_end": "2026-10-28",
      "expected_station_days": 17
    },
    {
      "station_code": "LEIR",
      "uka_id": "UKA00609",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LEIR",
      "uka_id": "UKA00609",
      "region": "East Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LEIR",
      "uka_id": "UKA00609",
      "region": "East Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LECU",
      "uka_id": "UKA00573",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LECU",
      "uka_id": "UKA00573",
      "region": "East Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LECU",
      "uka_id": "UKA00573",
      "region": "East Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LIN3",
      "uka_id": "UKA00561",
      "region": "East Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LOTA",
      "uka_id": "UKA01103",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LOTA",
      "uka_id": "UKA01103",
      "region": "East Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "MALA",
      "uka_id": "UKA01050",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "MALA",
      "uka_id": "UKA01050",
      "region": "East Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "NTN4",
      "uka_id": "UKA00632",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "NTN4",
      "uka_id": "UKA00632",
      "region": "East Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "NOTB",
      "uka_id": "UKA01092",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "NOTB",
      "uka_id": "UKA01092",
      "region": "East Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "NOTK",
      "uka_id": "UKA01048",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "NOTK",
      "uka_id": "UKA01048",
      "region": "East Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "NOTK",
      "uka_id": "UKA01048",
      "region": "East Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "NWBV",
      "uka_id": "UKA00618",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "NWBV",
      "uka_id": "UKA00618",
      "region": "East Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "NWBV",
      "uka_id": "UKA00618",
      "region": "East Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "WIGS",
      "uka_id": "UKA01176",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "WIGS",
      "uka_id": "UKA01176",
      "region": "East Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BEDC",
      "uka_id": "UKA01158",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BEDC",
      "uka_id": "UKA01158",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BIRR",
      "uka_id": "UKA00626",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BIRR",
      "uka_id": "UKA00626",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BIRR",
      "uka_id": "UKA00626",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BIHG",
      "uka_id": "UKA01062",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BIHG",
      "uka_id": "UKA01062",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BIHG",
      "uka_id": "UKA01062",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BMLD",
      "uka_id": "UKA00655",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BMLD",
      "uka_id": "UKA00655",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BMLD",
      "uka_id": "UKA00655",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BAQF",
      "uka_id": "UKA01108",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BAQF",
      "uka_id": "UKA01108",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BOTR",
      "uka_id": "UKA00652",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BOTR",
      "uka_id": "UKA00652",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BOTR",
      "uka_id": "UKA00652",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "CANK",
      "uka_id": "UKA00623",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "CANK",
      "uka_id": "UKA00623",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "COAL",
      "uka_id": "UKA00592",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "COAL",
      "uka_id": "UKA00592",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "COAL",
      "uka_id": "UKA00592",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "COBR",
      "uka_id": "UKA00634",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "COBR",
      "uka_id": "UKA00634",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "COBR",
      "uka_id": "UKA00634",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LEAM",
      "uka_id": "UKA00265",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LEAM",
      "uka_id": "UKA00265",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LEAM",
      "uka_id": "UKA00265",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LEAR",
      "uka_id": "UKA00564",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LEAR",
      "uka_id": "UKA00564",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LEAR",
      "uka_id": "UKA00564",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LEOM",
      "uka_id": "UKA00489",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BOLD",
      "uka_id": "UKA00595",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BOLD",
      "uka_id": "UKA00595",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BOLD",
      "uka_id": "UKA00595",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SHUN",
      "uka_id": "UKA01055",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SHUN",
      "uka_id": "UKA01055",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "STKR",
      "uka_id": "UKA00610",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "STKR",
      "uka_id": "UKA00610",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "STKR",
      "uka_id": "UKA00610",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "STOK",
      "uka_id": "UKA00337",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "STOK",
      "uka_id": "UKA00337",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "STOK",
      "uka_id": "UKA00337",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "TDHD",
      "uka_id": "UKA00648",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "TDHD",
      "uka_id": "UKA00648",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "TDHD",
      "uka_id": "UKA00648",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "WALD",
      "uka_id": "UKA01117",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "WALD",
      "uka_id": "UKA01117",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "WAL4",
      "uka_id": "UKA00565",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "WBKP",
      "uka_id": "UKA00658",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "WOLE",
      "uka_id": "UKA01162",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "WOLE",
      "uka_id": "UKA01162",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "WORT",
      "uka_id": "UKA01098",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "WORT",
      "uka_id": "UKA01098",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "CAMK",
      "uka_id": "UKA01115",
      "region": "East of England",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "CAMK",
      "uka_id": "UKA01115",
      "region": "East of England",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "CAM",
      "uka_id": "UKA00396",
      "region": "East of England",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "IPSC",
      "uka_id": "UKA01180",
      "region": "East of England",
      "pollutant": "PM2.5",
      "active_start": "2026-10-15",
      "period_end": "2026-10-28",
      "expected_station_days": 14
    },
    {
      "station_code": "IPSC",
      "uka_id": "UKA01180",
      "region": "East of England",
      "pollutant": "PM10",
      "active_start": "2026-10-15",
      "period_end": "2026-10-28",
      "expected_station_days": 14
    },
    {
      "station_code": "LUTR",
      "uka_id": "UKA00605",
      "region": "East of England",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LUTR",
      "uka_id": "UKA00605",
      "region": "East of England",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "NO12",
      "uka_id": "UKA00549",
      "region": "East of England",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "NO12",
      "uka_id": "UKA00549",
      "region": "East of England",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "NO12",
      "uka_id": "UKA00549",
      "region": "East of England",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "PEGE",
      "uka_id": "UKA01052",
      "region": "East of England",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "PEGE",
      "uka_id": "UKA01052",
      "region": "East of England",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SOUS",
      "uka_id": "UKA01096",
      "region": "East of England",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SOUS",
      "uka_id": "UKA01096",
      "region": "East of England",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SEND",
      "uka_id": "UKA00409",
      "region": "East of England",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SEND",
      "uka_id": "UKA00409",
      "region": "East of England",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SEND",
      "uka_id": "UKA00409",
      "region": "East of England",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "STGW",
      "uka_id": "UKA01156",
      "region": "East of England",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LONC",
      "uka_id": "UKA01119",
      "region": "London",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LONC",
      "uka_id": "UKA01119",
      "region": "London",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "CLL2",
      "uka_id": "UKA00211",
      "region": "London",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "CLL2",
      "uka_id": "UKA00211",
      "region": "London",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "CLL2",
      "uka_id": "UKA00211",
      "region": "London",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "HRL",
      "uka_id": "UKA00472",
      "region": "London",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "HRL",
      "uka_id": "UKA00472",
      "region": "London",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "HRL",
      "uka_id": "UKA00472",
      "region": "London",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "HIL",
      "uka_id": "UKA00266",
      "region": "London",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "HIL",
      "uka_id": "UKA00266",
      "region": "London",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "HIL",
      "uka_id": "UKA00266",
      "region": "London",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LONM",
      "uka_id": "UKA01100",
      "region": "London",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "LONM",
      "uka_id": "UKA01100",
      "region": "London",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "TED2",
      "uka_id": "UKA00572",
      "region": "London",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "TED2",
      "uka_id": "UKA00572",
      "region": "London",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "HORS",
      "uka_id": "UKA00435",
      "region": "London",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "HORS",
      "uka_id": "UKA00435",
      "region": "London",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "AYLA",
      "uka_id": "UKA01109",
      "region": "South East",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BRT3",
      "uka_id": "UKA00483",
      "region": "South East",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BRT3",
      "uka_id": "UKA00483",
      "region": "South East",
      "pollutant": "PM10",
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      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BRT3",
      "uka_id": "UKA00483",
      "region": "South East",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "CHAT",
      "uka_id": "UKA00553",
      "region": "South East",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "CHAT",
      "uka_id": "UKA00553",
      "region": "South East",
      "pollutant": "PM10",
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      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "CHAT",
      "uka_id": "UKA00553",
      "region": "South East",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "CRBE",
      "uka_id": "UKA01181",
      "region": "South East",
      "pollutant": "PM2.5",
      "active_start": "2026-10-13",
      "period_end": "2026-10-28",
      "expected_station_days": 16
    },
    {
      "station_code": "CRBE",
      "uka_id": "UKA01181",
      "region": "South East",
      "pollutant": "PM10",
      "active_start": "2026-10-13",
      "period_end": "2026-10-28",
      "expected_station_days": 16
    },
    {
      "station_code": "EB",
      "uka_id": "UKA00546",
      "region": "South East",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "EB",
      "uka_id": "UKA00546",
      "region": "South East",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "EB",
      "uka_id": "UKA00546",
      "region": "South East",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "FARC",
      "uka_id": "UKA01097",
      "region": "South East",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "FARC",
      "uka_id": "UKA01097",
      "region": "South East",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "HASB",
      "uka_id": "UKA01184",
      "region": "South East",
      "pollutant": "PM2.5",
      "active_start": "2026-10-21",
      "period_end": "2026-10-28",
      "expected_station_days": 8
    },
    {
      "station_code": "HASB",
      "uka_id": "UKA01184",
      "region": "South East",
      "pollutant": "PM10",
      "active_start": "2026-10-21",
      "period_end": "2026-10-28",
      "expected_station_days": 8
    },
    {
      "station_code": "MAID",
      "uka_id": "UKA01064",
      "region": "South East",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "MAID",
      "uka_id": "UKA01064",
      "region": "South East",
      "pollutant": "PM10",
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      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "MKCC",
      "uka_id": "UKA00963",
      "region": "South East",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "MKCC",
      "uka_id": "UKA00963",
      "region": "South East",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "OX",
      "uka_id": "UKA00258",
      "region": "South East",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "OX8",
      "uka_id": "UKA00518",
      "region": "South East",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "OX8",
      "uka_id": "UKA00518",
      "region": "South East",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "OX8",
      "uka_id": "UKA00518",
      "region": "South East",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "PMTH",
      "uka_id": "UKA00421",
      "region": "South East",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "PMTH",
      "uka_id": "UKA00421",
      "region": "South East",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "PMTH",
      "uka_id": "UKA00421",
      "region": "South East",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "POAR",
      "uka_id": "UKA00651",
      "region": "South East",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "POAR",
      "uka_id": "UKA00651",
      "region": "South East",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "POAR",
      "uka_id": "UKA00651",
      "region": "South East",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "REA5",
      "uka_id": "UKA00620",
      "region": "South East",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "REA5",
      "uka_id": "UKA00620",
      "region": "South East",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "REA1",
      "uka_id": "UKA00462",
      "region": "South East",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "REA1",
      "uka_id": "UKA00462",
      "region": "South East",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "REA1",
      "uka_id": "UKA00462",
      "region": "South East",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "RRKL",
      "uka_id": "UKA01053",
      "region": "South East",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SLOW",
      "uka_id": "UKA01091",
      "region": "South East",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SLOW",
      "uka_id": "UKA01091",
      "region": "South East",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SA33",
      "uka_id": "UKA00613",
      "region": "South East",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SA33",
      "uka_id": "UKA00613",
      "region": "South East",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SA33",
      "uka_id": "UKA00613",
      "region": "South East",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SOUT",
      "uka_id": "UKA00235",
      "region": "South East",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SOUT",
      "uka_id": "UKA00235",
      "region": "South East",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SOUT",
      "uka_id": "UKA00235",
      "region": "South East",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "STOR",
      "uka_id": "UKA00548",
      "region": "South East",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "STOR",
      "uka_id": "UKA00548",
      "region": "South East",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "STOR",
      "uka_id": "UKA00548",
      "region": "South East",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "WTHG",
      "uka_id": "UKA00628",
      "region": "South East",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "WTHG",
      "uka_id": "UKA00628",
      "region": "South East",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "WOEA",
      "uka_id": "UKA01061",
      "region": "South East",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "WOEA",
      "uka_id": "UKA01061",
      "region": "South East",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BPLE",
      "uka_id": "UKA00574",
      "region": "South West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BPLE",
      "uka_id": "UKA00574",
      "region": "South West",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BHA4",
      "uka_id": "UKA00660",
      "region": "South West",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BORN",
      "uka_id": "UKA00429",
      "region": "South West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BORN",
      "uka_id": "UKA00429",
      "region": "South West",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BOBV",
      "uka_id": "UKA01160",
      "region": "South West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BOBV",
      "uka_id": "UKA01160",
      "region": "South West",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BRIW",
      "uka_id": "UKA01120",
      "region": "South West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BRSP",
      "uka_id": "UKA01116",
      "region": "South West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BRSP",
      "uka_id": "UKA01116",
      "region": "South West",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BRS8",
      "uka_id": "UKA00494",
      "region": "South West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BRS8",
      "uka_id": "UKA00494",
      "region": "South West",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BRS8",
      "uka_id": "UKA00494",
      "region": "South West",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BR11",
      "uka_id": "UKA00631",
      "region": "South West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BR11",
      "uka_id": "UKA00631",
      "region": "South West",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "BR11",
      "uka_id": "UKA00631",
      "region": "South West",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "CHGR",
      "uka_id": "UKA01101",
      "region": "South West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "CHBR",
      "uka_id": "UKA00624",
      "region": "South West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "CHBR",
      "uka_id": "UKA00624",
      "region": "South West",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "EX",
      "uka_id": "UKA00263",
      "region": "South West",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "GLOT",
      "uka_id": "UKA01102",
      "region": "South West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "GLOT",
      "uka_id": "UKA01102",
      "region": "South West",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "HONI",
      "uka_id": "UKA00566",
      "region": "South West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "HONI",
      "uka_id": "UKA00566",
      "region": "South West",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "HONI",
      "uka_id": "UKA00566",
      "region": "South West",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "PLYM",
      "uka_id": "UKA00360",
      "region": "South West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "PLYM",
      "uka_id": "UKA00360",
      "region": "South West",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "PLYM",
      "uka_id": "UKA00360",
      "region": "South West",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "PLYR",
      "uka_id": "UKA00629",
      "region": "South West",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SASH",
      "uka_id": "UKA00569",
      "region": "South West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SASH",
      "uka_id": "UKA00569",
      "region": "South West",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SWHO",
      "uka_id": "UKA00650",
      "region": "South West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SWHO",
      "uka_id": "UKA00650",
      "region": "South West",
      "pollutant": "PM10",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    },
    {
      "station_code": "SWHO",
      "uka_id": "UKA00650",
      "region": "South West",
      "pollutant": "NO2",
      "active_start": "2026-09-29",
      "period_end": "2026-10-28",
      "expected_station_days": 30
    }
  ],
  "data_posture": "provisional and ratified official AURN automatic measurements, status flags preserved",
  "data_status_counts": {
    "contains_provisional": 9736
  },
  "provisional_or_as_supplied_pollutant_day_observations": 9736,
  "ratified_pollutant_day_observations": 0,
  "who_context_pollutant_day_observations": 258,
  "who_context_pollutant_day_observations_by_pollutant": {
    "NO2": 240,
    "PM10": 0,
    "PM2.5": 18
  },
  "provisional_or_as_supplied_station_days": 9736,
  "ratified_station_days": 0,
  "who_context_station_days": 258,
  "who_context_station_days_by_pollutant": {
    "NO2": 240,
    "PM10": 0,
    "PM2.5": 18
  },
  "who_context_count_definition": "Count of valid pollutant-day observations whose daily mean exceeded the pollutant-specific WHO 2021 24-hour contextual reference. This is not a UK legal exceedance count and is independent of station-period eligibility.",
  "canonical_metrics": {
    "schema": "aq26_england_canonical_metrics_v1",
    "valid_pollutant_day_observations": 9736,
    "unique_station_days": 4193,
    "expected_configured_pollutant_day_observations": 10120,
    "configured_stream_day_completeness_percent": 96.2,
    "provisional_or_as_supplied_pollutant_day_observations": 9736,
    "ratified_pollutant_day_observations": 0,
    "who_context_pollutant_day_observations": 258,
    "who_context_pollutant_day_observations_by_pollutant": {
      "NO2": 240,
      "PM10": 0,
      "PM2.5": 18
    },
    "definitions": {
      "pollutant_day_observation": "One valid station/date/pollutant daily-mean row.",
      "unique_station_day": "One distinct station/date pair with at least one valid pollutant daily mean.",
      "configured_stream_day_completeness": "Valid pollutant-day observations divided by expected configured pollutant-day observations.",
      "who_context_pollutant_day_observation": "A valid pollutant-day observation above the pollutant-specific WHO 2021 24-hour contextual reference; not a UK legal exceedance."
    }
  },
  "geographic_posture": "automatically discovered active English AURN station network; not population weighted and not a direct estimate of personal exposure",
  "claim_boundary": [
    "descriptive observed concentrations and data completeness only",
    "no source attribution or causation",
    "no legal compliance determination",
    "no individual exposure or health-risk determination",
    "regional comparisons are shown only where the multi-station eligibility rule is met"
  ],
  "methodology": {
    "daily_minimum_hourly_observations": 18,
    "station_period_minimum_valid_days": 15,
    "regional_aggregation": "equal-weight median of valid station-daily means",
    "who_2021_24h_context_ug_m3": {
      "PM2.5": 15.0,
      "PM10": 45.0,
      "NO2": 25.0
    },
    "invalid_daily_reference_comparison": "null/not assessed",
    "changing_panel_sensitivity": "daily reporting station and region counts plus fixed-panel series",
    "time_basis": "GMT hour ending; daily aggregation uses the printed source calendar date",
    "hour_ending_24_rule": "24:00 is retained as next-day 00:00 UTC but aggregated to the printed source calendar date",
    "accepted_quality_status_flags": {
      "R": "ratified",
      "P": "provisional",
      "P*": "as supplied"
    }
  },
  "licence": "© Crown copyright Defra via uk-air.defra.gov.uk, licensed under the Open Government Licence.",
  "generated_at_utc": "2026-10-29T16:16:54.678999+00:00",
  "station_discovery": {
    "method": "official active-site selector plus per-site AURN metadata pages",
    "discovered_active_english_sites": 179,
    "minimum_expected_active_english_sites": 75,
    "errors": [],
    "provenance": [
      {
        "stage": "station_search",
        "requested_url": "https://uk-air.defra.gov.uk/networks/search-site-info",
        "url": "https://uk-air.defra.gov.uk/networks/search-site-info",
        "redirect_chain": [],
        "http_status": 200,
        "content_type": "text/html; charset=UTF-8",
        "sha256": "4933d1d9e10f404b6759d2a5ee2998421068c36a70dce77b3b90cef95038fb44",
        "byte_count": 38838,
        "seed_count": 221,
        "page_title": "Site information search\n     \n - DEFRA UK Air - GOV.UK",
        "page_text_excerpt": "Site information search - DEFRA UK Air - GOV.UK Cookies on https://uk-air.defra.gov.uk We use some essential cookies to make this website work. We'd like to set additional cookies to understand how you use https://uk-air.defra.gov.uk, remember your settings and improve government services. We also use cookies set by other sites to help us deliver content from their services. Accept additional cook",
        "raw_path": "outputs/complete_period_review/raw/discovery/station_search.html",
        "retrieved_at_utc": "2026-10-29T16:16:55.792935+00:00"
      },
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