{
  "schema": "aq26_england_network_review_v3",
  "status": "partial_england_network_review",
  "target_area": "England",
  "period_start": "2026-09-18",
  "period_end": "2026-10-17",
  "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": 172,
  "configured_target_pollutant_station_count": 143,
  "reporting_station_count": 141,
  "reporting_station_coverage_percent": 98.6,
  "configured_target_stream_count": 332,
  "expected_configured_stream_days": 9960,
  "valid_pollutant_day_observations": 9752,
  "unique_station_days": 4211,
  "valid_station_days": 9752,
  "configured_stream_day_completeness_percent": 97.9,
  "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": 127,
      "configured_regions": 9,
      "expected_pollutant_day_observations": 3810,
      "expected_station_days": 3810,
      "reporting_stations": 125,
      "reporting_regions": 9,
      "valid_pollutant_day_observations": 3718,
      "valid_station_days": 3718,
      "configured_stream_day_completeness_percent": 97.6,
      "all_configured_regions_reporting": true,
      "coverage_status": "reporting"
    },
    {
      "pollutant": "PM10",
      "configured_station_streams": 109,
      "configured_regions": 9,
      "expected_pollutant_day_observations": 3270,
      "expected_station_days": 3270,
      "reporting_stations": 107,
      "reporting_regions": 9,
      "valid_pollutant_day_observations": 3187,
      "valid_station_days": 3187,
      "configured_stream_day_completeness_percent": 97.5,
      "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": 2847,
      "valid_station_days": 2847,
      "configured_stream_day_completeness_percent": 98.9,
      "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": 356,
      "valid_station_days": 356,
      "reporting_stations": 12,
      "completeness_percent": 98.9,
      "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": 294,
      "valid_station_days": 294,
      "reporting_stations": 10,
      "completeness_percent": 98.0,
      "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": 231,
      "valid_station_days": 231,
      "reporting_stations": 8,
      "completeness_percent": 96.2,
      "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": 540,
      "expected_station_days": 540,
      "valid_pollutant_day_observations": 533,
      "valid_station_days": 533,
      "reporting_stations": 18,
      "completeness_percent": 98.7,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "North West",
      "pollutant": "PM10",
      "expected_pollutant_day_observations": 480,
      "expected_station_days": 480,
      "valid_pollutant_day_observations": 479,
      "valid_station_days": 479,
      "reporting_stations": 16,
      "completeness_percent": 99.8,
      "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": 506,
      "valid_station_days": 506,
      "reporting_stations": 17,
      "completeness_percent": 99.2,
      "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": 570,
      "expected_station_days": 570,
      "valid_pollutant_day_observations": 570,
      "valid_station_days": 570,
      "reporting_stations": 19,
      "completeness_percent": 100.0,
      "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": 510,
      "expected_station_days": 510,
      "valid_pollutant_day_observations": 510,
      "valid_station_days": 510,
      "reporting_stations": 17,
      "completeness_percent": 100.0,
      "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": 446,
      "valid_station_days": 446,
      "reporting_stations": 15,
      "completeness_percent": 99.1,
      "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": 390,
      "expected_station_days": 390,
      "valid_pollutant_day_observations": 385,
      "valid_station_days": 385,
      "reporting_stations": 13,
      "completeness_percent": 98.7,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "East Midlands",
      "pollutant": "PM10",
      "expected_pollutant_day_observations": 330,
      "expected_station_days": 330,
      "valid_pollutant_day_observations": 330,
      "valid_station_days": 330,
      "reporting_stations": 11,
      "completeness_percent": 100.0,
      "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": 560,
      "valid_station_days": 560,
      "reporting_stations": 19,
      "completeness_percent": 98.2,
      "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": 530,
      "valid_station_days": 530,
      "reporting_stations": 18,
      "completeness_percent": 98.1,
      "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": 210,
      "expected_station_days": 210,
      "valid_pollutant_day_observations": 150,
      "valid_station_days": 150,
      "reporting_stations": 5,
      "completeness_percent": 71.4,
      "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": 150,
      "expected_station_days": 150,
      "valid_pollutant_day_observations": 120,
      "valid_station_days": 120,
      "reporting_stations": 4,
      "completeness_percent": 80.0,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": false,
      "coverage_status": "meets_minimum_floor_with_exception"
    },
    {
      "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": 540,
      "expected_station_days": 540,
      "valid_pollutant_day_observations": 540,
      "valid_station_days": 540,
      "reporting_stations": 18,
      "completeness_percent": 100.0,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": true,
      "coverage_status": "meets_national_threshold"
    },
    {
      "region": "South East",
      "pollutant": "PM10",
      "expected_pollutant_day_observations": 480,
      "expected_station_days": 480,
      "valid_pollutant_day_observations": 478,
      "valid_station_days": 478,
      "reporting_stations": 16,
      "completeness_percent": 99.6,
      "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": 387,
      "valid_station_days": 387,
      "reporting_stations": 13,
      "completeness_percent": 99.2,
      "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": 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"
    }
  ],
  "regional_coverage_exceptions": [
    {
      "region": "East of England",
      "pollutant": "PM10",
      "expected_pollutant_day_observations": 150,
      "expected_station_days": 150,
      "valid_pollutant_day_observations": 120,
      "valid_station_days": 120,
      "reporting_stations": 4,
      "completeness_percent": 80.0,
      "meets_minimum_cell_floor": true,
      "meets_national_stream_threshold": false,
      "coverage_status": "meets_minimum_floor_with_exception"
    },
    {
      "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": 881,
      "valid_station_days": 881,
      "coverage_status": "reporting"
    },
    {
      "region": "North West",
      "active_aurn_sites_discovered": 24,
      "configured_target_pollutant_sites": 23,
      "reporting_stations": 23,
      "pollutants_with_valid_daily_means": [
        "NO2",
        "PM10",
        "PM2.5"
      ],
      "valid_pollutant_day_observations": 1518,
      "valid_station_days": 1518,
      "coverage_status": "reporting"
    },
    {
      "region": "Yorkshire and the Humber",
      "active_aurn_sites_discovered": 21,
      "configured_target_pollutant_sites": 20,
      "reporting_stations": 20,
      "pollutants_with_valid_daily_means": [
        "NO2",
        "PM10",
        "PM2.5"
      ],
      "valid_pollutant_day_observations": 1526,
      "valid_station_days": 1526,
      "coverage_status": "reporting"
    },
    {
      "region": "East Midlands",
      "active_aurn_sites_discovered": 17,
      "configured_target_pollutant_sites": 14,
      "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": 1560,
      "valid_station_days": 1560,
      "coverage_status": "reporting"
    },
    {
      "region": "East of England",
      "active_aurn_sites_discovered": 15,
      "configured_target_pollutant_sites": 8,
      "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": 24,
      "configured_target_pollutant_sites": 20,
      "reporting_stations": 20,
      "pollutants_with_valid_daily_means": [
        "NO2",
        "PM10",
        "PM2.5"
      ],
      "valid_pollutant_day_observations": 1405,
      "valid_station_days": 1405,
      "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": 1012,
      "valid_station_days": 1012,
      "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": 5.85,
      "period_median_ug_m3": 6.06,
      "period_p95_daily_mean_ug_m3": 10.02,
      "max_daily_mean_ug_m3": 11.95,
      "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": 8.19,
      "period_median_ug_m3": 7.97,
      "period_p95_daily_mean_ug_m3": 13.76,
      "max_daily_mean_ug_m3": 15.01,
      "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": 4.24,
      "period_median_ug_m3": 3.98,
      "period_p95_daily_mean_ug_m3": 7.98,
      "max_daily_mean_ug_m3": 8.28,
      "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,
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      "pollutant": "PM10",
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      "median_daily_mean_ug_m3": 11.24,
      "p95_daily_mean_ug_m3": 16.94,
      "minimum_contributing_stations": 17,
      "median_contributing_stations": 17.0,
      "maximum_contributing_stations": 17,
      "regional_comparison_eligible_days": 30,
      "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": 5.7,
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      "minimum_contributing_stations": 19,
      "median_contributing_stations": 19.0,
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      "representativeness_note": "multi-station regional descriptive summary"
    }
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      "date": "2026-09-18",
      "region": "East Midlands",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 11.41,
      "regional_daily_mean_ug_m3": 11.2,
      "contributing_stations": 9,
      "regional_comparison_eligible": true
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      "date": "2026-09-18",
      "region": "East Midlands",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 15.03,
      "regional_daily_mean_ug_m3": 15.66,
      "contributing_stations": 11,
      "regional_comparison_eligible": true
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      "region": "East Midlands",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 8.44,
      "regional_daily_mean_ug_m3": 8.63,
      "contributing_stations": 13,
      "regional_comparison_eligible": true
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      "region": "East of England",
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      "regional_daily_median_ug_m3": 8.95,
      "regional_daily_mean_ug_m3": 9.12,
      "contributing_stations": 4,
      "regional_comparison_eligible": true
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      "date": "2026-09-18",
      "region": "East of England",
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      "regional_daily_median_ug_m3": 14.9,
      "regional_daily_mean_ug_m3": 14.54,
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      "regional_comparison_eligible": true
    },
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      "date": "2026-09-18",
      "region": "East of England",
      "pollutant": "PM2.5",
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      "regional_daily_mean_ug_m3": 8.19,
      "contributing_stations": 5,
      "regional_comparison_eligible": true
    },
    {
      "date": "2026-09-18",
      "region": "London",
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      "regional_daily_median_ug_m3": 15.33,
      "regional_daily_mean_ug_m3": 14.7,
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      "regional_comparison_eligible": true
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      "date": "2026-09-18",
      "region": "London",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 16.56,
      "regional_daily_mean_ug_m3": 17.41,
      "contributing_stations": 5,
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      "date": "2026-09-18",
      "region": "London",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 9.07,
      "regional_daily_mean_ug_m3": 8.96,
      "contributing_stations": 7,
      "regional_comparison_eligible": true
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      "region": "North East",
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      "regional_daily_median_ug_m3": 5.37,
      "regional_daily_mean_ug_m3": 7.48,
      "contributing_stations": 6,
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      "date": "2026-09-18",
      "region": "North East",
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      "regional_daily_median_ug_m3": 11.7,
      "regional_daily_mean_ug_m3": 12.19,
      "contributing_stations": 10,
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      "date": "2026-09-18",
      "region": "North East",
      "pollutant": "PM2.5",
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      "regional_daily_mean_ug_m3": 6.9,
      "contributing_stations": 12,
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      "date": "2026-09-18",
      "region": "North West",
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      "regional_daily_median_ug_m3": 9.36,
      "regional_daily_mean_ug_m3": 9.59,
      "contributing_stations": 16,
      "regional_comparison_eligible": true
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      "date": "2026-09-18",
      "region": "North West",
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      "regional_daily_median_ug_m3": 17.29,
      "regional_daily_mean_ug_m3": 17.04,
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      "region": "North West",
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      "regional_daily_mean_ug_m3": 9.23,
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      "date": "2026-09-18",
      "region": "South East",
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      "regional_daily_median_ug_m3": 9.18,
      "regional_daily_mean_ug_m3": 10.38,
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      "date": "2026-09-18",
      "region": "South East",
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      "regional_daily_median_ug_m3": 18.65,
      "regional_daily_mean_ug_m3": 18.89,
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      "region": "South East",
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      "regional_daily_mean_ug_m3": 9.42,
      "contributing_stations": 18,
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      "date": "2026-09-18",
      "region": "South West",
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      "regional_daily_median_ug_m3": 7.55,
      "regional_daily_mean_ug_m3": 8.4,
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      "date": "2026-09-18",
      "region": "South West",
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      "regional_daily_median_ug_m3": 21.55,
      "regional_daily_mean_ug_m3": 22.44,
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      "regional_comparison_eligible": true
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      "date": "2026-09-18",
      "region": "South West",
      "pollutant": "PM2.5",
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      "regional_daily_mean_ug_m3": 10.6,
      "contributing_stations": 14,
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      "date": "2026-09-18",
      "region": "West Midlands",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 6.97,
      "regional_daily_mean_ug_m3": 9.02,
      "contributing_stations": 16,
      "regional_comparison_eligible": true
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      "date": "2026-09-18",
      "region": "West Midlands",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 15.97,
      "regional_daily_mean_ug_m3": 16.01,
      "contributing_stations": 18,
      "regional_comparison_eligible": true
    },
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      "date": "2026-09-18",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 8.68,
      "regional_daily_mean_ug_m3": 8.74,
      "contributing_stations": 19,
      "regional_comparison_eligible": true
    },
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      "date": "2026-09-18",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 10.76,
      "regional_daily_mean_ug_m3": 10.43,
      "contributing_stations": 15,
      "regional_comparison_eligible": true
    },
    {
      "date": "2026-09-18",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 16.04,
      "regional_daily_mean_ug_m3": 16.09,
      "contributing_stations": 17,
      "regional_comparison_eligible": true
    },
    {
      "date": "2026-09-18",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 8.38,
      "regional_daily_mean_ug_m3": 8.74,
      "contributing_stations": 19,
      "regional_comparison_eligible": true
    },
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      "date": "2026-09-19",
      "region": "East Midlands",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 7.86,
      "regional_daily_mean_ug_m3": 7.48,
      "contributing_stations": 9,
      "regional_comparison_eligible": true
    },
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      "date": "2026-09-19",
      "region": "East Midlands",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 6.54,
      "regional_daily_mean_ug_m3": 6.77,
      "contributing_stations": 11,
      "regional_comparison_eligible": true
    },
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      "date": "2026-09-19",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 3.52,
      "regional_daily_mean_ug_m3": 3.5,
      "contributing_stations": 13,
      "regional_comparison_eligible": true
    },
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      "date": "2026-09-19",
      "region": "East of England",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 4.55,
      "regional_daily_mean_ug_m3": 5.5,
      "contributing_stations": 4,
      "regional_comparison_eligible": true
    },
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      "date": "2026-09-19",
      "region": "East of England",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 6.42,
      "regional_daily_mean_ug_m3": 6.73,
      "contributing_stations": 4,
      "regional_comparison_eligible": true
    },
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      "date": "2026-09-19",
      "region": "East of England",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 3.34,
      "regional_daily_mean_ug_m3": 3.66,
      "contributing_stations": 5,
      "regional_comparison_eligible": true
    },
    {
      "date": "2026-09-19",
      "region": "London",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 10.49,
      "regional_daily_mean_ug_m3": 9.65,
      "contributing_stations": 4,
      "regional_comparison_eligible": true
    },
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      "date": "2026-09-19",
      "region": "London",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 7.54,
      "regional_daily_mean_ug_m3": 7.58,
      "contributing_stations": 5,
      "regional_comparison_eligible": true
    },
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      "date": "2026-09-19",
      "region": "London",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 4.07,
      "regional_daily_mean_ug_m3": 3.92,
      "contributing_stations": 7,
      "regional_comparison_eligible": true
    },
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      "date": "2026-09-19",
      "region": "North East",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 2.23,
      "regional_daily_mean_ug_m3": 4.0,
      "contributing_stations": 7,
      "regional_comparison_eligible": true
    },
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      "date": "2026-09-19",
      "region": "North East",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 7.96,
      "regional_daily_mean_ug_m3": 8.02,
      "contributing_stations": 10,
      "regional_comparison_eligible": true
    },
    {
      "date": "2026-09-19",
      "region": "North East",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 3.63,
      "regional_daily_mean_ug_m3": 4.01,
      "contributing_stations": 12,
      "regional_comparison_eligible": true
    },
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      "date": "2026-09-19",
      "region": "North West",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 4.96,
      "regional_daily_mean_ug_m3": 5.94,
      "contributing_stations": 16,
      "regional_comparison_eligible": true
    },
    {
      "date": "2026-09-19",
      "region": "North West",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 9.65,
      "regional_daily_mean_ug_m3": 10.37,
      "contributing_stations": 16,
      "regional_comparison_eligible": true
    },
    {
      "date": "2026-09-19",
      "region": "North West",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 4.76,
      "regional_daily_mean_ug_m3": 5.23,
      "contributing_stations": 18,
      "regional_comparison_eligible": true
    },
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      "date": "2026-09-19",
      "region": "South East",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 5.56,
      "regional_daily_mean_ug_m3": 6.22,
      "contributing_stations": 12,
      "regional_comparison_eligible": true
    },
    {
      "date": "2026-09-19",
      "region": "South East",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 10.03,
      "regional_daily_mean_ug_m3": 9.93,
      "contributing_stations": 16,
      "regional_comparison_eligible": true
    },
    {
      "date": "2026-09-19",
      "region": "South East",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 5.26,
      "regional_daily_mean_ug_m3": 5.03,
      "contributing_stations": 18,
      "regional_comparison_eligible": true
    },
    {
      "date": "2026-09-19",
      "region": "South West",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 4.77,
      "regional_daily_mean_ug_m3": 5.28,
      "contributing_stations": 10,
      "regional_comparison_eligible": true
    },
    {
      "date": "2026-09-19",
      "region": "South West",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 9.75,
      "regional_daily_mean_ug_m3": 9.9,
      "contributing_stations": 10,
      "regional_comparison_eligible": true
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    {
      "date": "2026-09-19",
      "region": "South West",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 4.69,
      "regional_daily_mean_ug_m3": 4.75,
      "contributing_stations": 14,
      "regional_comparison_eligible": true
    },
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      "date": "2026-09-19",
      "region": "West Midlands",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 4.21,
      "regional_daily_mean_ug_m3": 5.54,
      "contributing_stations": 16,
      "regional_comparison_eligible": true
    },
    {
      "date": "2026-09-19",
      "region": "West Midlands",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 6.94,
      "regional_daily_mean_ug_m3": 7.07,
      "contributing_stations": 18,
      "regional_comparison_eligible": true
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      "date": "2026-09-19",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 3.6,
      "regional_daily_mean_ug_m3": 3.6,
      "contributing_stations": 19,
      "regional_comparison_eligible": true
    },
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      "date": "2026-09-19",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 7.71,
      "regional_daily_mean_ug_m3": 7.63,
      "contributing_stations": 15,
      "regional_comparison_eligible": true
    },
    {
      "date": "2026-09-19",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 8.05,
      "regional_daily_mean_ug_m3": 8.06,
      "contributing_stations": 17,
      "regional_comparison_eligible": true
    },
    {
      "date": "2026-09-19",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 4.17,
      "regional_daily_mean_ug_m3": 4.28,
      "contributing_stations": 19,
      "regional_comparison_eligible": true
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    {
      "date": "2026-09-20",
      "region": "East Midlands",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 10.73,
      "regional_daily_mean_ug_m3": 11.66,
      "contributing_stations": 9,
      "regional_comparison_eligible": true
    },
    {
      "date": "2026-09-20",
      "region": "East Midlands",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 12.59,
      "regional_daily_mean_ug_m3": 12.94,
      "contributing_stations": 11,
      "regional_comparison_eligible": true
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    {
      "date": "2026-09-20",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 6.44,
      "regional_daily_mean_ug_m3": 6.48,
      "contributing_stations": 13,
      "regional_comparison_eligible": true
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      "date": "2026-09-20",
      "region": "East of England",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 9.43,
      "regional_daily_mean_ug_m3": 12.32,
      "contributing_stations": 4,
      "regional_comparison_eligible": true
    },
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      "date": "2026-09-20",
      "region": "East of England",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 11.46,
      "regional_daily_mean_ug_m3": 11.26,
      "contributing_stations": 4,
      "regional_comparison_eligible": true
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      "date": "2026-09-20",
      "region": "East of England",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 6.6,
      "regional_daily_mean_ug_m3": 6.1,
      "contributing_stations": 5,
      "regional_comparison_eligible": true
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    {
      "date": "2026-09-20",
      "region": "London",
      "pollutant": "NO2",
      "regional_daily_median_ug_m3": 14.42,
      "regional_daily_mean_ug_m3": 15.29,
      "contributing_stations": 4,
      "regional_comparison_eligible": true
    },
    {
      "date": "2026-09-20",
      "region": "London",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 10.1,
      "regional_daily_mean_ug_m3": 10.62,
      "contributing_stations": 5,
      "regional_comparison_eligible": true
    },
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      "date": "2026-09-20",
      "region": "London",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 5.55,
      "regional_daily_mean_ug_m3": 6.05,
      "contributing_stations": 7,
      "regional_comparison_eligible": true
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      "date": "2026-09-20",
      "region": "North East",
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      "regional_daily_median_ug_m3": 2.32,
      "regional_daily_mean_ug_m3": 3.34,
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      "regional_comparison_eligible": true
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      "date": "2026-09-20",
      "region": "North East",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 10.25,
      "regional_daily_mean_ug_m3": 10.65,
      "contributing_stations": 10,
      "regional_comparison_eligible": true
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      "date": "2026-09-20",
      "region": "North East",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 4.97,
      "regional_daily_mean_ug_m3": 5.34,
      "contributing_stations": 12,
      "regional_comparison_eligible": true
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      "region": "North West",
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      "regional_daily_median_ug_m3": 6.88,
      "regional_daily_mean_ug_m3": 7.27,
      "contributing_stations": 16,
      "regional_comparison_eligible": true
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      "date": "2026-09-20",
      "region": "North West",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 16.37,
      "regional_daily_mean_ug_m3": 16.66,
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      "date": "2026-09-20",
      "region": "North West",
      "pollutant": "PM2.5",
      "regional_daily_median_ug_m3": 7.84,
      "regional_daily_mean_ug_m3": 7.8,
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      "region": "South East",
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      "regional_daily_median_ug_m3": 13.39,
      "regional_daily_mean_ug_m3": 12.57,
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      "region": "South East",
      "pollutant": "PM10",
      "regional_daily_median_ug_m3": 10.52,
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      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "PRES",
      "uka_id": "UKA00408",
      "region": "North West",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "PRES",
      "uka_id": "UKA00408",
      "region": "North West",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "ROCB",
      "uka_id": "UKA01174",
      "region": "North West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "ROCB",
      "uka_id": "UKA01174",
      "region": "North West",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "ECCL",
      "uka_id": "UKA00339",
      "region": "North West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "ECCL",
      "uka_id": "UKA00339",
      "region": "North West",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "ECCL",
      "uka_id": "UKA00339",
      "region": "North West",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "CW",
      "uka_id": "UKA00579",
      "region": "North West",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "SHLW",
      "uka_id": "UKA00627",
      "region": "North West",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "SHLW",
      "uka_id": "UKA00627",
      "region": "North West",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "TAMM",
      "uka_id": "UKA01099",
      "region": "North West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "WARP",
      "uka_id": "UKA01175",
      "region": "North West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "WARP",
      "uka_id": "UKA01175",
      "region": "North West",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "WARP",
      "uka_id": "UKA01175",
      "region": "North West",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "WSMR",
      "uka_id": "UKA00603",
      "region": "North West",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "WIG5",
      "uka_id": "UKA00482",
      "region": "North West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "WIG5",
      "uka_id": "UKA00482",
      "region": "North West",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "WIG5",
      "uka_id": "UKA00482",
      "region": "North West",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "TRAN",
      "uka_id": "UKA00406",
      "region": "North West",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "TRAN",
      "uka_id": "UKA00406",
      "region": "North West",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "TRAN",
      "uka_id": "UKA00406",
      "region": "North West",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BAR3",
      "uka_id": "UKA00353",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BAR3",
      "uka_id": "UKA00353",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BAR3",
      "uka_id": "UKA00353",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BDMA",
      "uka_id": "UKA00611",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BRAS",
      "uka_id": "UKA01090",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BRAS",
      "uka_id": "UKA01090",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BRWP",
      "uka_id": "UKA01161",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BRWP",
      "uka_id": "UKA01161",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "DYAG",
      "uka_id": "UKA00654",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "DYAG",
      "uka_id": "UKA00654",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "DYAG",
      "uka_id": "UKA00654",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "DCST",
      "uka_id": "UKA00612",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "DCST",
      "uka_id": "UKA00612",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "HARW",
      "uka_id": "UKA01093",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "HARW",
      "uka_id": "UKA01093",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "HUL2",
      "uka_id": "UKA00450",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "HUL2",
      "uka_id": "UKA00450",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "HUL2",
      "uka_id": "UKA00450",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "HULR",
      "uka_id": "UKA00600",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "HULR",
      "uka_id": "UKA00600",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "HULR",
      "uka_id": "UKA00600",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "IMGM",
      "uka_id": "UKA00647",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "IMGM",
      "uka_id": "UKA00647",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "IMGM",
      "uka_id": "UKA00647",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "LEED",
      "uka_id": "UKA00222",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "LEED",
      "uka_id": "UKA00222",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "LEED",
      "uka_id": "UKA00222",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "LED6",
      "uka_id": "UKA00527",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "LED6",
      "uka_id": "UKA00527",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "LED6",
      "uka_id": "UKA00527",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "ROED",
      "uka_id": "UKA01054",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "ROED",
      "uka_id": "UKA01054",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "SCN2",
      "uka_id": "UKA00381",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "SCN2",
      "uka_id": "UKA00381",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "SCN2",
      "uka_id": "UKA00381",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "SHBR",
      "uka_id": "UKA00622",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "SHBR",
      "uka_id": "UKA00622",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "SHDG",
      "uka_id": "UKA00575",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "SHDG",
      "uka_id": "UKA00575",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "SHDG",
      "uka_id": "UKA00575",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "SHE",
      "uka_id": "UKA00181",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "SHE",
      "uka_id": "UKA00181",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "SHE",
      "uka_id": "UKA00181",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "WAKA",
      "uka_id": "UKA01107",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "WAKA",
      "uka_id": "UKA01107",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "YK10",
      "uka_id": "UKA00523",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "YK10",
      "uka_id": "UKA00523",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "YK10",
      "uka_id": "UKA00523",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "YK11",
      "uka_id": "UKA00524",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "YK11",
      "uka_id": "UKA00524",
      "region": "Yorkshire and the Humber",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "YK11",
      "uka_id": "UKA00524",
      "region": "Yorkshire and the Humber",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "CHLG",
      "uka_id": "UKA00604",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "CHLG",
      "uka_id": "UKA00604",
      "region": "East Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "CHLG",
      "uka_id": "UKA00604",
      "region": "East Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "CHS7",
      "uka_id": "UKA00529",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "CHS7",
      "uka_id": "UKA00529",
      "region": "East Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "CHS7",
      "uka_id": "UKA00529",
      "region": "East Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "DESA",
      "uka_id": "UKA00630",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "DESA",
      "uka_id": "UKA00630",
      "region": "East Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "DESB",
      "uka_id": "UKA01027",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "DESB",
      "uka_id": "UKA01027",
      "region": "East Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "LEIR",
      "uka_id": "UKA00609",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "LEIR",
      "uka_id": "UKA00609",
      "region": "East Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "LEIR",
      "uka_id": "UKA00609",
      "region": "East Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "LECU",
      "uka_id": "UKA00573",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "LECU",
      "uka_id": "UKA00573",
      "region": "East Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "LECU",
      "uka_id": "UKA00573",
      "region": "East Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "LIN3",
      "uka_id": "UKA00561",
      "region": "East Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "LOTA",
      "uka_id": "UKA01103",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "LOTA",
      "uka_id": "UKA01103",
      "region": "East Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "MALA",
      "uka_id": "UKA01050",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "MALA",
      "uka_id": "UKA01050",
      "region": "East Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "NTN4",
      "uka_id": "UKA00632",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "NTN4",
      "uka_id": "UKA00632",
      "region": "East Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "NOTB",
      "uka_id": "UKA01092",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "NOTB",
      "uka_id": "UKA01092",
      "region": "East Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "NOTK",
      "uka_id": "UKA01048",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "NOTK",
      "uka_id": "UKA01048",
      "region": "East Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "NOTK",
      "uka_id": "UKA01048",
      "region": "East Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "NWBV",
      "uka_id": "UKA00618",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "NWBV",
      "uka_id": "UKA00618",
      "region": "East Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "NWBV",
      "uka_id": "UKA00618",
      "region": "East Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "WIGS",
      "uka_id": "UKA01176",
      "region": "East Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "WIGS",
      "uka_id": "UKA01176",
      "region": "East Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BEDC",
      "uka_id": "UKA01158",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BEDC",
      "uka_id": "UKA01158",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BIRR",
      "uka_id": "UKA00626",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BIRR",
      "uka_id": "UKA00626",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BIRR",
      "uka_id": "UKA00626",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BIHG",
      "uka_id": "UKA01062",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BIHG",
      "uka_id": "UKA01062",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BIHG",
      "uka_id": "UKA01062",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BMLD",
      "uka_id": "UKA00655",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BMLD",
      "uka_id": "UKA00655",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BMLD",
      "uka_id": "UKA00655",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BAQF",
      "uka_id": "UKA01108",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BAQF",
      "uka_id": "UKA01108",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BOTR",
      "uka_id": "UKA00652",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BOTR",
      "uka_id": "UKA00652",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BOTR",
      "uka_id": "UKA00652",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "CANK",
      "uka_id": "UKA00623",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "CANK",
      "uka_id": "UKA00623",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "COAL",
      "uka_id": "UKA00592",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "COAL",
      "uka_id": "UKA00592",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "COAL",
      "uka_id": "UKA00592",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "COBR",
      "uka_id": "UKA00634",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "COBR",
      "uka_id": "UKA00634",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "COBR",
      "uka_id": "UKA00634",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "LEAM",
      "uka_id": "UKA00265",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "LEAM",
      "uka_id": "UKA00265",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "LEAM",
      "uka_id": "UKA00265",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "LEAR",
      "uka_id": "UKA00564",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "LEAR",
      "uka_id": "UKA00564",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "LEAR",
      "uka_id": "UKA00564",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "LEOM",
      "uka_id": "UKA00489",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BOLD",
      "uka_id": "UKA00595",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BOLD",
      "uka_id": "UKA00595",
      "region": "West Midlands",
      "pollutant": "PM10",
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      "period_end": "2026-10-17",
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    },
    {
      "station_code": "BOLD",
      "uka_id": "UKA00595",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "SHUN",
      "uka_id": "UKA01055",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "SHUN",
      "uka_id": "UKA01055",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "STKR",
      "uka_id": "UKA00610",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "STKR",
      "uka_id": "UKA00610",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "STKR",
      "uka_id": "UKA00610",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "STOK",
      "uka_id": "UKA00337",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "STOK",
      "uka_id": "UKA00337",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "STOK",
      "uka_id": "UKA00337",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "TDHD",
      "uka_id": "UKA00648",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "TDHD",
      "uka_id": "UKA00648",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "TDHD",
      "uka_id": "UKA00648",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "WALD",
      "uka_id": "UKA01117",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "WALD",
      "uka_id": "UKA01117",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "WAL4",
      "uka_id": "UKA00565",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "WBKP",
      "uka_id": "UKA00658",
      "region": "West Midlands",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "WOLE",
      "uka_id": "UKA01162",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "WOLE",
      "uka_id": "UKA01162",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "WORT",
      "uka_id": "UKA01098",
      "region": "West Midlands",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "WORT",
      "uka_id": "UKA01098",
      "region": "West Midlands",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "CAMK",
      "uka_id": "UKA01115",
      "region": "East of England",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "CAMK",
      "uka_id": "UKA01115",
      "region": "East of England",
      "pollutant": "PM10",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "CAM",
      "uka_id": "UKA00396",
      "region": "East of England",
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      "period_end": "2026-10-17",
      "expected_station_days": 30
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    {
      "station_code": "LUTR",
      "uka_id": "UKA00605",
      "region": "East of England",
      "pollutant": "PM2.5",
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      "period_end": "2026-10-17",
      "expected_station_days": 30
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    {
      "station_code": "LUTR",
      "uka_id": "UKA00605",
      "region": "East of England",
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      "period_end": "2026-10-17",
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    {
      "station_code": "NO12",
      "uka_id": "UKA00549",
      "region": "East of England",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "NO12",
      "uka_id": "UKA00549",
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      "period_end": "2026-10-17",
      "expected_station_days": 30
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    {
      "station_code": "NO12",
      "uka_id": "UKA00549",
      "region": "East of England",
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      "period_end": "2026-10-17",
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    {
      "station_code": "PEGE",
      "uka_id": "UKA01052",
      "region": "East of England",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
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    {
      "station_code": "PEGE",
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      "period_end": "2026-10-17",
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    {
      "station_code": "SOUS",
      "uka_id": "UKA01096",
      "region": "East of England",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
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    {
      "station_code": "SOUS",
      "uka_id": "UKA01096",
      "region": "East of England",
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    {
      "station_code": "SEND",
      "uka_id": "UKA00409",
      "region": "East of England",
      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
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    {
      "station_code": "SEND",
      "uka_id": "UKA00409",
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    {
      "station_code": "SEND",
      "uka_id": "UKA00409",
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    {
      "station_code": "STGW",
      "uka_id": "UKA01156",
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      "station_code": "LONC",
      "uka_id": "UKA01119",
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      "station_code": "LONC",
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    {
      "station_code": "CLL2",
      "uka_id": "UKA00211",
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      "station_code": "CLL2",
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      "station_code": "CLL2",
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      "station_code": "HRL",
      "uka_id": "UKA00472",
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      "station_code": "HRL",
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      "station_code": "HRL",
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      "station_code": "HIL",
      "uka_id": "UKA00266",
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      "station_code": "HIL",
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      "station_code": "HIL",
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      "station_code": "LONM",
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      "station_code": "LONM",
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      "station_code": "TED2",
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      "station_code": "TED2",
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      "station_code": "HORS",
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      "station_code": "HORS",
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      "station_code": "AYLA",
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      "station_code": "BRT3",
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      "station_code": "CHAT",
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      "station_code": "CHAT",
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      "station_code": "EB",
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      "station_code": "FARC",
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      "station_code": "MAID",
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      "station_code": "MKCC",
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      "station_code": "SA33",
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      "station_code": "SOUT",
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      "station_code": "WTHG",
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      "pollutant": "PM2.5",
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      "station_code": "WOEA",
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      "region": "South East",
      "pollutant": "PM2.5",
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      "station_code": "WOEA",
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      "region": "South East",
      "pollutant": "PM10",
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      "station_code": "BPLE",
      "uka_id": "UKA00574",
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      "pollutant": "PM2.5",
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      "period_end": "2026-10-17",
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      "station_code": "BPLE",
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      "region": "South West",
      "pollutant": "PM10",
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      "station_code": "BHA4",
      "uka_id": "UKA00660",
      "region": "South West",
      "pollutant": "NO2",
      "active_start": "2026-09-18",
      "period_end": "2026-10-17",
      "expected_station_days": 30
    },
    {
      "station_code": "BORN",
      "uka_id": "UKA00429",
      "region": "South West",
      "pollutant": "PM2.5",
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      "station_code": "BOBV",
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      "pollutant": "PM2.5",
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      "pollutant": "PM2.5",
      "active_start": "2026-09-18",
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      "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.",
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  "licence": "© Crown copyright Defra via uk-air.defra.gov.uk, licensed under the Open Government Licence.",
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