{ "schema": "aq26_england_network_review_v3", "status": "complete_england_network_review", "target_area": "England", "period_start": "2026-07-31", "period_end": "2026-08-29", "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": 171, "configured_target_pollutant_station_count": 142, "reporting_station_count": 141, "reporting_station_coverage_percent": 99.3, "configured_target_stream_count": 330, "expected_configured_stream_days": 9900, "valid_pollutant_day_observations": 9415, "unique_station_days": 4178, "valid_station_days": 9415, "configured_stream_day_completeness_percent": 95.1, "national_publication_ready": true, "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": 126, "configured_regions": 9, "expected_pollutant_day_observations": 3780, "expected_station_days": 3780, "reporting_stations": 125, "reporting_regions": 9, "valid_pollutant_day_observations": 3651, "valid_station_days": 3651, "configured_stream_day_completeness_percent": 96.6, "all_configured_regions_reporting": true, "coverage_status": "reporting" }, { "pollutant": "PM10", "configured_station_streams": 108, "configured_regions": 9, "expected_pollutant_day_observations": 3240, "expected_station_days": 3240, "reporting_stations": 106, "reporting_regions": 9, "valid_pollutant_day_observations": 3103, "valid_station_days": 3103, "configured_stream_day_completeness_percent": 95.8, "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": 94, "reporting_regions": 9, "valid_pollutant_day_observations": 2661, "valid_station_days": 2661, "configured_stream_day_completeness_percent": 92.4, "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": 299, "valid_station_days": 299, "reporting_stations": 11, "completeness_percent": 83.1, "meets_minimum_cell_floor": true, "meets_national_stream_threshold": false, "coverage_status": "meets_minimum_floor_with_exception" }, { "region": "North East", "pollutant": "PM10", "expected_pollutant_day_observations": 300, "expected_station_days": 300, "valid_pollutant_day_observations": 256, "valid_station_days": 256, "reporting_stations": 9, "completeness_percent": 85.3, "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": 204, "valid_station_days": 204, "reporting_stations": 7, "completeness_percent": 85.0, "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": 540, "expected_station_days": 540, "valid_pollutant_day_observations": 529, "valid_station_days": 529, "reporting_stations": 18, "completeness_percent": 98.0, "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": 461, "valid_station_days": 461, "reporting_stations": 16, "completeness_percent": 96.0, "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": 452, "valid_station_days": 452, "reporting_stations": 16, "completeness_percent": 88.6, "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": 545, "valid_station_days": 545, "reporting_stations": 19, "completeness_percent": 95.6, "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": 485, "valid_station_days": 485, "reporting_stations": 17, "completeness_percent": 95.1, "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": 413, "valid_station_days": 413, "reporting_stations": 15, "completeness_percent": 91.8, "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": 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": "East Midlands", "pollutant": "PM10", "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" }, { "region": "East Midlands", "pollutant": "NO2", "expected_pollutant_day_observations": 270, "expected_station_days": 270, "valid_pollutant_day_observations": 257, "valid_station_days": 257, "reporting_stations": 9, "completeness_percent": 95.2, "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": 568, "valid_station_days": 568, "reporting_stations": 19, "completeness_percent": 99.6, "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": 538, "valid_station_days": 538, "reporting_stations": 18, "completeness_percent": 99.6, "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": 454, "valid_station_days": 454, "reporting_stations": 16, "completeness_percent": 94.6, "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": 207, "valid_station_days": 207, "reporting_stations": 7, "completeness_percent": 98.6, "meets_minimum_cell_floor": true, "meets_national_stream_threshold": true, "coverage_status": "meets_national_threshold" }, { "region": "East of England", "pollutant": "PM10", "expected_pollutant_day_observations": 150, "expected_station_days": 150, "valid_pollutant_day_observations": 150, "valid_station_days": 150, "reporting_stations": 5, "completeness_percent": 100.0, "meets_minimum_cell_floor": true, "meets_national_stream_threshold": true, "coverage_status": "meets_national_threshold" }, { "region": "East of England", "pollutant": "NO2", "expected_pollutant_day_observations": 120, "expected_station_days": 120, "valid_pollutant_day_observations": 114, "valid_station_days": 114, "reporting_stations": 4, "completeness_percent": 95.0, "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": 114, "valid_station_days": 114, "reporting_stations": 4, "completeness_percent": 95.0, "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": 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": "South East", "pollutant": "PM10", "expected_pollutant_day_observations": 480, "expected_station_days": 480, "valid_pollutant_day_observations": 474, "valid_station_days": 474, "reporting_stations": 16, "completeness_percent": 98.8, "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": 361, "valid_station_days": 361, "reporting_stations": 13, "completeness_percent": 92.6, "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": 409, "valid_station_days": 409, "reporting_stations": 14, "completeness_percent": 97.4, "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": 291, "valid_station_days": 291, "reporting_stations": 10, "completeness_percent": 97.0, "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": 292, "valid_station_days": 292, "reporting_stations": 10, "completeness_percent": 97.3, "meets_minimum_cell_floor": true, "meets_national_stream_threshold": true, "coverage_status": "meets_national_threshold" } ], "regional_coverage_exceptions": [ { "region": "North East", "pollutant": "PM2.5", "expected_pollutant_day_observations": 360, "expected_station_days": 360, "valid_pollutant_day_observations": 299, "valid_station_days": 299, "reporting_stations": 11, "completeness_percent": 83.1, "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": 11, "pollutants_with_valid_daily_means": [ "NO2", "PM10", "PM2.5" ], "valid_pollutant_day_observations": 759, "valid_station_days": 759, "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": 1442, "valid_station_days": 1442, "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": 1443, "valid_station_days": 1443, "coverage_status": "reporting" }, { "region": "East Midlands", "active_aurn_sites_discovered": 16, "configured_target_pollutant_sites": 13, "reporting_stations": 13, "pollutants_with_valid_daily_means": [ "NO2", "PM10", "PM2.5" ], "valid_pollutant_day_observations": 913, "valid_station_days": 913, "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": 8, "pollutants_with_valid_daily_means": [ "NO2", "PM10", "PM2.5" ], "valid_pollutant_day_observations": 471, "valid_station_days": 471, "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": 470, "valid_station_days": 470, "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": 1365, "valid_station_days": 1365, "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": 992, "valid_station_days": 992, "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": 28, "ratified_days": 0, "provisional_or_as_supplied_days": 28, "period_stat_eligible": true, "fixed_panel_eligible": true, "period_mean_ug_m3": 5.06, "period_median_ug_m3": 4.74, "period_p95_daily_mean_ug_m3": 8.3, "max_daily_mean_ug_m3": 12.87, "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": 10.43, "period_median_ug_m3": 8.31, "period_p95_daily_mean_ug_m3": 21.04, "max_daily_mean_ug_m3": 22.58, "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": 4.93, "period_median_ug_m3": 4.06, "period_p95_daily_mean_ug_m3": 10.92, "max_daily_mean_ug_m3": 12.29, "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": 26, "ratified_days": 0, "provisional_or_as_supplied_days": 26, "period_stat_eligible": true, "fixed_panel_eligible": false, "period_mean_ug_m3": 9.16, "period_median_ug_m3": 8.91, "period_p95_daily_mean_ug_m3": 13.97, "max_daily_mean_ug_m3": 15.53, "days_above_who_reference": 0 }, { "region": "East Midlands", "station_code": "CHS7", "uka_id": "UKA00529", "station_name": "Chesterfield Roadside", "environment_type": "Urban Traffic", "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": 12.59, "period_median_ug_m3": 9.53, "period_p95_daily_mean_ug_m3": 24.29, "max_daily_mean_ug_m3": 42.85, "days_above_who_reference": 0 }, { "region": "East Midlands", "station_code": "CHS7", "uka_id": "UKA00529", "station_name": "Chesterfield Roadside", "environment_type": "Urban Traffic", "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": 5.35, "period_median_ug_m3": 4.42, "period_p95_daily_mean_ug_m3": 12.73, "max_daily_mean_ug_m3": 13.97, "days_above_who_reference": 0 }, { "region": "East Midlands", "station_code": "DESA", "uka_id": "UKA00630", "station_name": "Derby St Alkmund's Way", "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": 18.1, "period_median_ug_m3": 17.32, "period_p95_daily_mean_ug_m3": 30.56, "max_daily_mean_ug_m3": 34.2, "days_above_who_reference": 3 }, { "region": "East Midlands", "station_code": "DESA", "uka_id": "UKA00630", "station_name": "Derby St Alkmund's Way", "environment_type": "Urban Traffic", "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": 5.48, "period_median_ug_m3": 4.77, "period_p95_daily_mean_ug_m3": 10.11, "max_daily_mean_ug_m3": 12.88, "days_above_who_reference": 0 }, { "region": "East Midlands", "station_code": "DESB", "uka_id": "UKA01027", "station_name": "Derby Stockbrook Park", "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": 11.37, "period_median_ug_m3": 9.62, "period_p95_daily_mean_ug_m3": 22.22, 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"active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "WIG5", "uka_id": "UKA00482", "region": "North West", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "WIG5", "uka_id": "UKA00482", "region": "North West", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "TRAN", "uka_id": "UKA00406", "region": "North West", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "TRAN", "uka_id": "UKA00406", "region": "North West", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "TRAN", "uka_id": "UKA00406", "region": "North West", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BAR3", "uka_id": "UKA00353", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BAR3", "uka_id": "UKA00353", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BAR3", "uka_id": "UKA00353", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BDMA", "uka_id": "UKA00611", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BRAS", "uka_id": "UKA01090", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BRAS", "uka_id": "UKA01090", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BRWP", "uka_id": "UKA01161", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BRWP", "uka_id": "UKA01161", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "DYAG", "uka_id": "UKA00654", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "DYAG", "uka_id": "UKA00654", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "DYAG", "uka_id": "UKA00654", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "DCST", "uka_id": "UKA00612", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "DCST", "uka_id": "UKA00612", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "HARW", "uka_id": "UKA01093", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "HARW", "uka_id": "UKA01093", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "HUL2", "uka_id": "UKA00450", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "HUL2", "uka_id": "UKA00450", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "HUL2", "uka_id": "UKA00450", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "HULR", "uka_id": "UKA00600", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "HULR", "uka_id": "UKA00600", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "HULR", "uka_id": "UKA00600", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "IMGM", "uka_id": "UKA00647", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "IMGM", "uka_id": "UKA00647", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "IMGM", "uka_id": "UKA00647", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LEED", "uka_id": "UKA00222", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LEED", "uka_id": "UKA00222", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LEED", "uka_id": "UKA00222", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LED6", "uka_id": "UKA00527", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LED6", "uka_id": "UKA00527", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LED6", "uka_id": "UKA00527", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "ROED", "uka_id": "UKA01054", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "ROED", "uka_id": "UKA01054", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SCN2", "uka_id": "UKA00381", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SCN2", "uka_id": "UKA00381", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SCN2", "uka_id": "UKA00381", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SHBR", "uka_id": "UKA00622", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SHBR", "uka_id": "UKA00622", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SHDG", "uka_id": "UKA00575", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SHDG", "uka_id": "UKA00575", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SHDG", "uka_id": "UKA00575", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SHE", "uka_id": "UKA00181", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SHE", "uka_id": "UKA00181", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SHE", "uka_id": "UKA00181", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "WAKA", "uka_id": "UKA01107", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "WAKA", "uka_id": "UKA01107", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "YK10", "uka_id": "UKA00523", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "YK10", "uka_id": "UKA00523", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "YK10", "uka_id": "UKA00523", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "YK11", "uka_id": "UKA00524", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "YK11", "uka_id": "UKA00524", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "YK11", "uka_id": "UKA00524", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "CHLG", "uka_id": "UKA00604", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "CHLG", "uka_id": "UKA00604", "region": "East Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "CHLG", "uka_id": "UKA00604", "region": "East Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "CHS7", "uka_id": "UKA00529", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "CHS7", "uka_id": "UKA00529", "region": "East Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "CHS7", "uka_id": "UKA00529", "region": "East Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "DESA", "uka_id": "UKA00630", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "DESA", "uka_id": "UKA00630", "region": "East Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "DESB", "uka_id": "UKA01027", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "DESB", "uka_id": "UKA01027", "region": "East Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LEIR", "uka_id": "UKA00609", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LEIR", "uka_id": "UKA00609", "region": "East Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LEIR", "uka_id": "UKA00609", "region": "East Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LECU", "uka_id": "UKA00573", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LECU", "uka_id": "UKA00573", "region": "East Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LECU", "uka_id": "UKA00573", "region": "East Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LIN3", "uka_id": "UKA00561", "region": "East Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LOTA", "uka_id": "UKA01103", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LOTA", "uka_id": "UKA01103", "region": "East Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "MALA", "uka_id": "UKA01050", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "MALA", "uka_id": "UKA01050", "region": "East Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "NTN4", "uka_id": "UKA00632", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "NTN4", "uka_id": "UKA00632", "region": "East Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "NOTB", "uka_id": "UKA01092", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "NOTB", "uka_id": "UKA01092", "region": "East Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "NOTK", "uka_id": "UKA01048", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "NOTK", "uka_id": "UKA01048", "region": "East Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "NOTK", "uka_id": "UKA01048", "region": "East Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "NWBV", "uka_id": "UKA00618", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "NWBV", "uka_id": "UKA00618", "region": "East Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "NWBV", "uka_id": "UKA00618", "region": "East Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BEDC", "uka_id": "UKA01158", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BEDC", "uka_id": "UKA01158", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BIRR", "uka_id": "UKA00626", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BIRR", "uka_id": "UKA00626", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BIRR", "uka_id": "UKA00626", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BIHG", "uka_id": "UKA01062", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BIHG", "uka_id": "UKA01062", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BIHG", "uka_id": "UKA01062", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BMLD", "uka_id": "UKA00655", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BMLD", "uka_id": "UKA00655", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BMLD", "uka_id": "UKA00655", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BAQF", "uka_id": "UKA01108", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BAQF", "uka_id": "UKA01108", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BOTR", "uka_id": "UKA00652", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BOTR", "uka_id": "UKA00652", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BOTR", "uka_id": "UKA00652", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "CANK", "uka_id": "UKA00623", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "CANK", "uka_id": "UKA00623", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "COAL", "uka_id": "UKA00592", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "COAL", "uka_id": "UKA00592", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "COAL", "uka_id": "UKA00592", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "COBR", "uka_id": "UKA00634", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "COBR", "uka_id": "UKA00634", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "COBR", "uka_id": "UKA00634", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LEAM", "uka_id": "UKA00265", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LEAM", "uka_id": "UKA00265", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LEAM", "uka_id": "UKA00265", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LEAR", "uka_id": "UKA00564", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LEAR", "uka_id": "UKA00564", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LEAR", "uka_id": "UKA00564", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LEOM", "uka_id": "UKA00489", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BOLD", "uka_id": "UKA00595", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BOLD", "uka_id": "UKA00595", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BOLD", "uka_id": "UKA00595", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SHUN", "uka_id": "UKA01055", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SHUN", "uka_id": "UKA01055", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "STKR", "uka_id": "UKA00610", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "STKR", "uka_id": "UKA00610", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "STKR", "uka_id": "UKA00610", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "STOK", "uka_id": "UKA00337", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "STOK", "uka_id": "UKA00337", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "STOK", "uka_id": "UKA00337", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "TDHD", "uka_id": "UKA00648", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "TDHD", "uka_id": "UKA00648", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "TDHD", "uka_id": "UKA00648", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "WALD", "uka_id": "UKA01117", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "WALD", "uka_id": "UKA01117", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "WAL4", "uka_id": "UKA00565", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "WBKP", "uka_id": "UKA00658", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "WOLE", "uka_id": "UKA01162", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "WOLE", "uka_id": "UKA01162", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "WORT", "uka_id": "UKA01098", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "WORT", "uka_id": "UKA01098", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "CAMK", "uka_id": "UKA01115", "region": "East of England", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "CAMK", "uka_id": "UKA01115", "region": "East of England", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "CAM", "uka_id": "UKA00396", "region": "East of England", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LUTR", "uka_id": "UKA00605", "region": "East of England", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LUTR", "uka_id": "UKA00605", "region": "East of England", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "NO12", "uka_id": "UKA00549", "region": "East of England", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "NO12", "uka_id": "UKA00549", "region": "East of England", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "NO12", "uka_id": "UKA00549", "region": "East of England", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "PEGE", "uka_id": "UKA01052", "region": "East of England", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "PEGE", "uka_id": "UKA01052", "region": "East of England", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SOUS", "uka_id": "UKA01096", "region": "East of England", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SOUS", "uka_id": "UKA01096", "region": "East of England", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SEND", "uka_id": "UKA00409", "region": "East of England", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SEND", "uka_id": "UKA00409", "region": "East of England", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SEND", "uka_id": "UKA00409", "region": "East of England", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "STGW", "uka_id": "UKA01156", "region": "East of England", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LONC", "uka_id": "UKA01119", "region": "London", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LONC", "uka_id": "UKA01119", "region": "London", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "CLL2", "uka_id": "UKA00211", "region": "London", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "CLL2", "uka_id": "UKA00211", "region": "London", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "CLL2", "uka_id": "UKA00211", "region": "London", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "HRL", "uka_id": "UKA00472", "region": "London", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "HRL", "uka_id": "UKA00472", "region": "London", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "HRL", "uka_id": "UKA00472", "region": "London", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "HIL", "uka_id": "UKA00266", "region": "London", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "HIL", "uka_id": "UKA00266", "region": "London", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "HIL", "uka_id": "UKA00266", "region": "London", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LONM", "uka_id": "UKA01100", "region": "London", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "LONM", "uka_id": "UKA01100", "region": "London", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "TED2", "uka_id": "UKA00572", "region": "London", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "TED2", "uka_id": "UKA00572", "region": "London", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "HORS", "uka_id": "UKA00435", "region": "London", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "HORS", "uka_id": "UKA00435", "region": "London", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "AYLA", "uka_id": "UKA01109", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BRT3", "uka_id": "UKA00483", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BRT3", "uka_id": "UKA00483", "region": "South East", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BRT3", "uka_id": "UKA00483", "region": "South East", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "CHAT", "uka_id": "UKA00553", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "CHAT", "uka_id": "UKA00553", "region": "South East", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "CHAT", "uka_id": "UKA00553", "region": "South East", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "EB", "uka_id": "UKA00546", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "EB", "uka_id": "UKA00546", "region": "South East", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "EB", "uka_id": "UKA00546", "region": "South East", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "FARC", "uka_id": "UKA01097", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "FARC", "uka_id": "UKA01097", "region": "South East", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "MAID", "uka_id": "UKA01064", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "MAID", "uka_id": "UKA01064", "region": "South East", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "MKCC", "uka_id": "UKA00963", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "MKCC", "uka_id": "UKA00963", "region": "South East", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "OX", "uka_id": "UKA00258", "region": "South East", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "OX8", "uka_id": "UKA00518", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "OX8", "uka_id": "UKA00518", "region": "South East", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "OX8", "uka_id": "UKA00518", "region": "South East", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "PMTH", "uka_id": "UKA00421", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "PMTH", "uka_id": "UKA00421", "region": "South East", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "PMTH", "uka_id": "UKA00421", "region": "South East", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "POAR", "uka_id": "UKA00651", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "POAR", "uka_id": "UKA00651", "region": "South East", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "POAR", "uka_id": "UKA00651", "region": "South East", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "REA5", "uka_id": "UKA00620", "region": "South East", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "REA5", "uka_id": "UKA00620", "region": "South East", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "REA1", "uka_id": "UKA00462", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "REA1", "uka_id": "UKA00462", "region": "South East", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "REA1", "uka_id": "UKA00462", "region": "South East", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "RRKL", "uka_id": "UKA01053", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SLOW", "uka_id": "UKA01091", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SLOW", "uka_id": "UKA01091", "region": "South East", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SA33", "uka_id": "UKA00613", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SA33", "uka_id": "UKA00613", "region": "South East", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SA33", "uka_id": "UKA00613", "region": "South East", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SOUT", "uka_id": "UKA00235", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SOUT", "uka_id": "UKA00235", "region": "South East", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SOUT", "uka_id": "UKA00235", "region": "South East", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "STOR", "uka_id": "UKA00548", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "STOR", "uka_id": "UKA00548", "region": "South East", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "STOR", "uka_id": "UKA00548", "region": "South East", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "WTHG", "uka_id": "UKA00628", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "WTHG", "uka_id": "UKA00628", "region": "South East", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "WOEA", "uka_id": "UKA01061", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "WOEA", "uka_id": "UKA01061", "region": "South East", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BPLE", "uka_id": "UKA00574", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BPLE", "uka_id": "UKA00574", "region": "South West", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BHA4", "uka_id": "UKA00660", "region": "South West", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BORN", "uka_id": "UKA00429", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BORN", "uka_id": "UKA00429", "region": "South West", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BOBV", "uka_id": "UKA01160", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BOBV", "uka_id": "UKA01160", "region": "South West", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BRIW", "uka_id": "UKA01120", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BRSP", "uka_id": "UKA01116", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BRSP", "uka_id": "UKA01116", "region": "South West", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BRS8", "uka_id": "UKA00494", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BRS8", "uka_id": "UKA00494", "region": "South West", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BRS8", "uka_id": "UKA00494", "region": "South West", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BR11", "uka_id": "UKA00631", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BR11", "uka_id": "UKA00631", "region": "South West", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "BR11", "uka_id": "UKA00631", "region": "South West", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "CHGR", "uka_id": "UKA01101", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "CHBR", "uka_id": "UKA00624", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "CHBR", "uka_id": "UKA00624", "region": "South West", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "EX", "uka_id": "UKA00263", "region": "South West", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "GLOT", "uka_id": "UKA01102", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "GLOT", "uka_id": "UKA01102", "region": "South West", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "HONI", "uka_id": "UKA00566", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "HONI", "uka_id": "UKA00566", "region": "South West", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "HONI", "uka_id": "UKA00566", "region": "South West", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "PLYM", "uka_id": "UKA00360", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "PLYM", "uka_id": "UKA00360", "region": "South West", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "PLYM", "uka_id": "UKA00360", "region": "South West", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "PLYR", "uka_id": "UKA00629", "region": "South West", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SASH", "uka_id": "UKA00569", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SASH", "uka_id": "UKA00569", "region": "South West", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SWHO", "uka_id": "UKA00650", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SWHO", "uka_id": "UKA00650", "region": "South West", "pollutant": "PM10", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 }, { "station_code": "SWHO", "uka_id": "UKA00650", "region": "South West", "pollutant": "NO2", "active_start": "2026-07-31", "period_end": "2026-08-29", "expected_station_days": 30 } ], "data_posture": "provisional and ratified official AURN automatic measurements, status flags preserved", "data_status_counts": { "contains_provisional": 9415 }, "provisional_or_as_supplied_pollutant_day_observations": 9415, "ratified_pollutant_day_observations": 0, "who_context_pollutant_day_observations": 214, "who_context_pollutant_day_observations_by_pollutant": { "NO2": 184, "PM10": 2, "PM2.5": 28 }, "provisional_or_as_supplied_station_days": 9415, "ratified_station_days": 0, "who_context_station_days": 214, "who_context_station_days_by_pollutant": { "NO2": 184, "PM10": 2, "PM2.5": 28 }, "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": 9415, "unique_station_days": 4178, "expected_configured_pollutant_day_observations": 9900, "configured_stream_day_completeness_percent": 95.1, "provisional_or_as_supplied_pollutant_day_observations": 9415, "ratified_pollutant_day_observations": 0, "who_context_pollutant_day_observations": 214, "who_context_pollutant_day_observations_by_pollutant": { "NO2": 184, "PM10": 2, "PM2.5": 28 }, "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": "2026-08-30T11:10:00.214318+00:00", "station_discovery": { "method": "official active-site selector plus per-site AURN metadata pages", "discovered_active_english_sites": 171, "minimum_expected_active_english_sites": 75, "errors": [], "provenance": [ { "stage": "station_search", "url": "https://uk-air.defra.gov.uk/networks/search-site-info", "http_status": 200, "sha256": "a850816011c8f7abc3b729fa0694fcad880f6cf977081315d94f7caa30adcbc7", "byte_count": 38239, "retrieved_at_utc": "2026-08-30T11:10:00.784777+00:00" }, { "stage": "station_detail", "uka_id": "UKA00615", "url": "https://uk-air.defra.gov.uk/networks/site-info?uka_id=UKA00615", "http_status": 200, "sha256": "f661caef2589b320a0cab6d51d6804985929669c96eae6e7613edee41923cf9e", "byte_count": 29480, "retrieved_at_utc": "2026-08-30T11:10:01.413793+00:00" }, { "stage": "station_detail", "uka_id": "UKA00503", "url": "https://uk-air.defra.gov.uk/networks/site-info?uka_id=UKA00503", "http_status": 200, "sha256": "d682750df3f04f5023e53e5a7193576ef955a94ba45609f8ed8fe15b5598d46b", "byte_count": 35829, "retrieved_at_utc": "2026-08-30T11:10:01.456544+00:00" }, { "stage": "station_detail", "uka_id": "UKA00633", "url": "https://uk-air.defra.gov.uk/networks/site-info?uka_id=UKA00633", "http_status": 200, "sha256": "e8db1b6c02946c14c69bd87ac5e767441883dc7360d9b18afa3eaed0eace56fd", "byte_count": 28382, "retrieved_at_utc": "2026-08-30T11:10:01.478596+00:00" }, { "stage": "station_detail", "uka_id": "UKA00933", "url": "https://uk-air.defra.gov.uk/networks/site-info?uka_id=UKA00933", "http_status": 200, "sha256": 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"retrieved_at_utc": "2026-08-30T11:10:02.163322+00:00" }, { "stage": "station_detail", "uka_id": "UKA00212", "url": "https://uk-air.defra.gov.uk/networks/site-info?uka_id=UKA00212", "http_status": 200, "sha256": "0f0dc183a9246c36597bfd3b87855c37091d4f34a630a2b32827e08d584f8edd", "byte_count": 39529, "retrieved_at_utc": "2026-08-30T11:10:02.207014+00:00" }, { "stage": "station_detail", "uka_id": "UKA00594", "url": "https://uk-air.defra.gov.uk/networks/site-info?uka_id=UKA00594", "http_status": 200, "sha256": "718d0e1e9b3184d98abe1f1bd7b0bfedef1eecba8e379981362405ad2ed49b82", "byte_count": 28815, "retrieved_at_utc": "2026-08-30T11:10:02.332021+00:00" }, { "stage": "station_detail", "uka_id": "UKA01109", "url": "https://uk-air.defra.gov.uk/networks/site-info?uka_id=UKA01109", "http_status": 200, "sha256": "e1e8f780374f11b9043ada1333af5d3ced878c4223f6bc35410fbc42b0be2c80", "byte_count": 28027, "retrieved_at_utc": "2026-08-30T11:10:02.359451+00:00" }, { "stage": "station_detail", "uka_id": 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