{ "schema": "aq26_england_network_review_v3", "status": "partial_england_network_review", "target_area": "England", "period_start": "2026-09-13", "period_end": "2026-10-12", "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": 9727, "unique_station_days": 4216, "valid_station_days": 9727, "configured_stream_day_completeness_percent": 97.7, "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": 3713, "valid_station_days": 3713, "configured_stream_day_completeness_percent": 97.5, "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": 3185, "valid_station_days": 3185, "configured_stream_day_completeness_percent": 97.4, "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": 2829, "valid_station_days": 2829, "configured_stream_day_completeness_percent": 98.2, "all_configured_regions_reporting": true, "coverage_status": "reporting" } ], "region_pollutant_coverage": [ { "region": "North East", "pollutant": "PM2.5", "expected_pollutant_day_observations": 360, "expected_station_days": 360, "valid_pollutant_day_observations": 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": 296, "valid_station_days": 296, "reporting_stations": 10, "completeness_percent": 98.7, "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": 218, "valid_station_days": 218, "reporting_stations": 8, "completeness_percent": 90.8, "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": 472, "valid_station_days": 472, "reporting_stations": 16, "completeness_percent": 98.3, "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": 503, "valid_station_days": 503, "reporting_stations": 17, "completeness_percent": 98.6, "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": 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": 508, "valid_station_days": 508, "reporting_stations": 17, "completeness_percent": 99.6, "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": 448, "valid_station_days": 448, "reporting_stations": 15, "completeness_percent": 99.6, "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": 383, "valid_station_days": 383, "reporting_stations": 13, "completeness_percent": 98.2, "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": 263, "valid_station_days": 263, "reporting_stations": 9, "completeness_percent": 97.4, "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": 565, "valid_station_days": 565, "reporting_stations": 19, "completeness_percent": 99.1, "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": 535, "valid_station_days": 535, "reporting_stations": 18, "completeness_percent": 99.1, "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": 472, "valid_station_days": 472, "reporting_stations": 16, "completeness_percent": 98.3, "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": 408, "valid_station_days": 408, "reporting_stations": 14, "completeness_percent": 97.1, "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": 870, "valid_station_days": 870, "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": 1508, "valid_station_days": 1508, "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": 976, "valid_station_days": 976, "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": 1572, "valid_station_days": 1572, "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": 1004, "valid_station_days": 1004, "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": 5.36, "period_median_ug_m3": 5.79, "period_p95_daily_mean_ug_m3": 10.01, "max_daily_mean_ug_m3": 12.35, "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": 7.82, "period_median_ug_m3": 7.65, "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": 4.08, "period_median_ug_m3": 3.94, "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, "period_mean_ug_m3": 10.02, "period_median_ug_m3": 10.18, "period_p95_daily_mean_ug_m3": 14.82, "max_daily_mean_ug_m3": 19.01, "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": 8.58, "period_median_ug_m3": 8.6, "period_p95_daily_mean_ug_m3": 14.42, "max_daily_mean_ug_m3": 15.99, "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": 4.52, "period_median_ug_m3": 4.43, "period_p95_daily_mean_ug_m3": 8.41, "max_daily_mean_ug_m3": 8.89, "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": 22.5, "period_median_ug_m3": 23.25, "period_p95_daily_mean_ug_m3": 30.04, "max_daily_mean_ug_m3": 34.11, "days_above_who_reference": 12 }, { "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": 5.3, "period_median_ug_m3": 5.17, "period_p95_daily_mean_ug_m3": 8.66, "max_daily_mean_ug_m3": 9.73, "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": 8.68, "period_median_ug_m3": 8.8, "period_p95_daily_mean_ug_m3": 14.32, 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"2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "TRAN", "uka_id": "UKA00406", "region": "North West", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BAR3", "uka_id": "UKA00353", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BAR3", "uka_id": "UKA00353", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BAR3", "uka_id": "UKA00353", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BDMA", "uka_id": "UKA00611", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BRAS", "uka_id": "UKA01090", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BRAS", "uka_id": "UKA01090", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BRWP", "uka_id": "UKA01161", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BRWP", "uka_id": "UKA01161", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "DYAG", "uka_id": "UKA00654", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "DYAG", "uka_id": "UKA00654", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "DYAG", "uka_id": "UKA00654", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "DCST", "uka_id": "UKA00612", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "DCST", "uka_id": "UKA00612", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "HARW", "uka_id": "UKA01093", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "HARW", "uka_id": "UKA01093", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "HUL2", "uka_id": "UKA00450", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "HUL2", "uka_id": "UKA00450", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "HUL2", "uka_id": "UKA00450", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "HULR", "uka_id": "UKA00600", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "HULR", "uka_id": "UKA00600", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "HULR", "uka_id": "UKA00600", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "IMGM", "uka_id": "UKA00647", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "IMGM", "uka_id": "UKA00647", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "IMGM", "uka_id": "UKA00647", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LEED", "uka_id": "UKA00222", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LEED", "uka_id": "UKA00222", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LEED", "uka_id": "UKA00222", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LED6", "uka_id": "UKA00527", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LED6", "uka_id": "UKA00527", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LED6", "uka_id": "UKA00527", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "ROED", "uka_id": "UKA01054", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "ROED", "uka_id": "UKA01054", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SCN2", "uka_id": "UKA00381", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SCN2", "uka_id": "UKA00381", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SCN2", "uka_id": "UKA00381", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SHBR", "uka_id": "UKA00622", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SHBR", "uka_id": "UKA00622", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SHDG", "uka_id": "UKA00575", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SHDG", "uka_id": "UKA00575", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SHDG", "uka_id": "UKA00575", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SHE", "uka_id": "UKA00181", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SHE", "uka_id": "UKA00181", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SHE", "uka_id": "UKA00181", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "WAKA", "uka_id": "UKA01107", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "WAKA", "uka_id": "UKA01107", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "YK10", "uka_id": "UKA00523", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "YK10", "uka_id": "UKA00523", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "YK10", "uka_id": "UKA00523", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "YK11", "uka_id": "UKA00524", "region": "Yorkshire and the Humber", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "YK11", "uka_id": "UKA00524", "region": "Yorkshire and the Humber", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "YK11", "uka_id": "UKA00524", "region": "Yorkshire and the Humber", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "CHLG", "uka_id": "UKA00604", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "CHLG", "uka_id": "UKA00604", "region": "East Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "CHLG", "uka_id": "UKA00604", "region": "East Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "CHS7", "uka_id": "UKA00529", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "CHS7", "uka_id": "UKA00529", "region": "East Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "CHS7", "uka_id": "UKA00529", "region": "East Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "DESA", "uka_id": "UKA00630", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "DESA", "uka_id": "UKA00630", "region": "East Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "DESB", "uka_id": "UKA01027", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "DESB", "uka_id": "UKA01027", "region": "East Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LEIR", "uka_id": "UKA00609", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LEIR", "uka_id": "UKA00609", "region": "East Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LEIR", "uka_id": "UKA00609", "region": "East Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LECU", "uka_id": "UKA00573", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LECU", "uka_id": "UKA00573", "region": "East Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LECU", "uka_id": "UKA00573", "region": "East Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LIN3", "uka_id": "UKA00561", "region": "East Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LOTA", "uka_id": "UKA01103", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LOTA", "uka_id": "UKA01103", "region": "East Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "MALA", "uka_id": "UKA01050", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "MALA", "uka_id": "UKA01050", "region": "East Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "NTN4", "uka_id": "UKA00632", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "NTN4", "uka_id": "UKA00632", "region": "East Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "NOTB", "uka_id": "UKA01092", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "NOTB", "uka_id": "UKA01092", "region": "East Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "NOTK", "uka_id": "UKA01048", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "NOTK", "uka_id": "UKA01048", "region": "East Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "NOTK", "uka_id": "UKA01048", "region": "East Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "NWBV", "uka_id": "UKA00618", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "NWBV", "uka_id": "UKA00618", "region": "East Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "NWBV", "uka_id": "UKA00618", "region": "East Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "WIGS", "uka_id": "UKA01176", "region": "East Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "WIGS", "uka_id": "UKA01176", "region": "East Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BEDC", "uka_id": "UKA01158", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BEDC", "uka_id": "UKA01158", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BIRR", "uka_id": "UKA00626", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BIRR", "uka_id": "UKA00626", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BIRR", "uka_id": "UKA00626", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BIHG", "uka_id": "UKA01062", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BIHG", "uka_id": "UKA01062", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BIHG", "uka_id": "UKA01062", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BMLD", "uka_id": "UKA00655", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BMLD", "uka_id": "UKA00655", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BMLD", "uka_id": "UKA00655", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BAQF", "uka_id": "UKA01108", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BAQF", "uka_id": "UKA01108", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BOTR", "uka_id": "UKA00652", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BOTR", "uka_id": "UKA00652", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BOTR", "uka_id": "UKA00652", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "CANK", "uka_id": "UKA00623", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "CANK", "uka_id": "UKA00623", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "COAL", "uka_id": "UKA00592", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "COAL", "uka_id": "UKA00592", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "COAL", "uka_id": "UKA00592", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "COBR", "uka_id": "UKA00634", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "COBR", "uka_id": "UKA00634", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "COBR", "uka_id": "UKA00634", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LEAM", "uka_id": "UKA00265", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LEAM", "uka_id": "UKA00265", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LEAM", "uka_id": "UKA00265", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LEAR", "uka_id": "UKA00564", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LEAR", "uka_id": "UKA00564", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LEAR", "uka_id": "UKA00564", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LEOM", "uka_id": "UKA00489", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BOLD", "uka_id": "UKA00595", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BOLD", "uka_id": "UKA00595", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BOLD", "uka_id": "UKA00595", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SHUN", "uka_id": "UKA01055", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SHUN", "uka_id": "UKA01055", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "STKR", "uka_id": "UKA00610", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "STKR", "uka_id": "UKA00610", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "STKR", "uka_id": "UKA00610", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "STOK", "uka_id": "UKA00337", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "STOK", "uka_id": "UKA00337", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "STOK", "uka_id": "UKA00337", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "TDHD", "uka_id": "UKA00648", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "TDHD", "uka_id": "UKA00648", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "TDHD", "uka_id": "UKA00648", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "WALD", "uka_id": "UKA01117", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "WALD", "uka_id": "UKA01117", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "WAL4", "uka_id": "UKA00565", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "WBKP", "uka_id": "UKA00658", "region": "West Midlands", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "WOLE", "uka_id": "UKA01162", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "WOLE", "uka_id": "UKA01162", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "WORT", "uka_id": "UKA01098", "region": "West Midlands", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "WORT", "uka_id": "UKA01098", "region": "West Midlands", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "CAMK", "uka_id": "UKA01115", "region": "East of England", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "CAMK", "uka_id": "UKA01115", "region": "East of England", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "CAM", "uka_id": "UKA00396", "region": "East of England", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LUTR", "uka_id": "UKA00605", "region": "East of England", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LUTR", "uka_id": "UKA00605", "region": "East of England", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "NO12", "uka_id": "UKA00549", "region": "East of England", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "NO12", "uka_id": "UKA00549", "region": "East of England", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "NO12", "uka_id": "UKA00549", "region": "East of England", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "PEGE", "uka_id": "UKA01052", "region": "East of England", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "PEGE", "uka_id": "UKA01052", "region": "East of England", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SOUS", "uka_id": "UKA01096", "region": "East of England", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SOUS", "uka_id": "UKA01096", "region": "East of England", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SEND", "uka_id": "UKA00409", "region": "East of England", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SEND", "uka_id": "UKA00409", "region": "East of England", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SEND", "uka_id": "UKA00409", "region": "East of England", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "STGW", "uka_id": "UKA01156", "region": "East of England", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LONC", "uka_id": "UKA01119", "region": "London", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LONC", "uka_id": "UKA01119", "region": "London", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "CLL2", "uka_id": "UKA00211", "region": "London", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "CLL2", "uka_id": "UKA00211", "region": "London", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "CLL2", "uka_id": "UKA00211", "region": "London", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "HRL", "uka_id": "UKA00472", "region": "London", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "HRL", "uka_id": "UKA00472", "region": "London", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "HRL", "uka_id": "UKA00472", "region": "London", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "HIL", "uka_id": "UKA00266", "region": "London", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "HIL", "uka_id": "UKA00266", "region": "London", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "HIL", "uka_id": "UKA00266", "region": "London", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LONM", "uka_id": "UKA01100", "region": "London", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "LONM", "uka_id": "UKA01100", "region": "London", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "TED2", "uka_id": "UKA00572", "region": "London", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "TED2", "uka_id": "UKA00572", "region": "London", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "HORS", "uka_id": "UKA00435", "region": "London", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "HORS", "uka_id": "UKA00435", "region": "London", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "AYLA", "uka_id": "UKA01109", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BRT3", "uka_id": "UKA00483", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BRT3", "uka_id": "UKA00483", "region": "South East", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BRT3", "uka_id": "UKA00483", "region": "South East", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "CHAT", "uka_id": "UKA00553", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "CHAT", "uka_id": "UKA00553", "region": "South East", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "CHAT", "uka_id": "UKA00553", "region": "South East", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "EB", "uka_id": "UKA00546", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "EB", "uka_id": "UKA00546", "region": "South East", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "EB", "uka_id": "UKA00546", "region": "South East", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "FARC", "uka_id": "UKA01097", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "FARC", "uka_id": "UKA01097", "region": "South East", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "MAID", "uka_id": "UKA01064", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "MAID", "uka_id": "UKA01064", "region": "South East", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "MKCC", "uka_id": "UKA00963", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "MKCC", "uka_id": "UKA00963", "region": "South East", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "OX", "uka_id": "UKA00258", "region": "South East", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "OX8", "uka_id": "UKA00518", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "OX8", "uka_id": "UKA00518", "region": "South East", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "OX8", "uka_id": "UKA00518", "region": "South East", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "PMTH", "uka_id": "UKA00421", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "PMTH", "uka_id": "UKA00421", "region": "South East", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "PMTH", "uka_id": "UKA00421", "region": "South East", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "POAR", "uka_id": "UKA00651", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "POAR", "uka_id": "UKA00651", "region": "South East", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "POAR", "uka_id": "UKA00651", "region": "South East", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "REA5", "uka_id": "UKA00620", "region": "South East", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "REA5", "uka_id": "UKA00620", "region": "South East", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "REA1", "uka_id": "UKA00462", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "REA1", "uka_id": "UKA00462", "region": "South East", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "REA1", "uka_id": "UKA00462", "region": "South East", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "RRKL", "uka_id": "UKA01053", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SLOW", "uka_id": "UKA01091", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SLOW", "uka_id": "UKA01091", "region": "South East", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SA33", "uka_id": "UKA00613", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SA33", "uka_id": "UKA00613", "region": "South East", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SA33", "uka_id": "UKA00613", "region": "South East", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SOUT", "uka_id": "UKA00235", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SOUT", "uka_id": "UKA00235", "region": "South East", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SOUT", "uka_id": "UKA00235", "region": "South East", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "STOR", "uka_id": "UKA00548", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "STOR", "uka_id": "UKA00548", "region": "South East", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "STOR", "uka_id": "UKA00548", "region": "South East", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "WTHG", "uka_id": "UKA00628", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "WTHG", "uka_id": "UKA00628", "region": "South East", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "WOEA", "uka_id": "UKA01061", "region": "South East", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "WOEA", "uka_id": "UKA01061", "region": "South East", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BPLE", "uka_id": "UKA00574", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BPLE", "uka_id": "UKA00574", "region": "South West", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BHA4", "uka_id": "UKA00660", "region": "South West", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BORN", "uka_id": "UKA00429", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BORN", "uka_id": "UKA00429", "region": "South West", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BOBV", "uka_id": "UKA01160", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BOBV", "uka_id": "UKA01160", "region": "South West", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BRIW", "uka_id": "UKA01120", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BRSP", "uka_id": "UKA01116", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BRSP", "uka_id": "UKA01116", "region": "South West", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BRS8", "uka_id": "UKA00494", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BRS8", "uka_id": "UKA00494", "region": "South West", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BRS8", "uka_id": "UKA00494", "region": "South West", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BR11", "uka_id": "UKA00631", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BR11", "uka_id": "UKA00631", "region": "South West", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "BR11", "uka_id": "UKA00631", "region": "South West", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "CHGR", "uka_id": "UKA01101", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "CHBR", "uka_id": "UKA00624", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "CHBR", "uka_id": "UKA00624", "region": "South West", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "EX", "uka_id": "UKA00263", "region": "South West", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "GLOT", "uka_id": "UKA01102", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "GLOT", "uka_id": "UKA01102", "region": "South West", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "HONI", "uka_id": "UKA00566", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "HONI", "uka_id": "UKA00566", "region": "South West", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "HONI", "uka_id": "UKA00566", "region": "South West", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "PLYM", "uka_id": "UKA00360", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "PLYM", "uka_id": "UKA00360", "region": "South West", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "PLYM", "uka_id": "UKA00360", "region": "South West", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "PLYR", "uka_id": "UKA00629", "region": "South West", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SASH", "uka_id": "UKA00569", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SASH", "uka_id": "UKA00569", "region": "South West", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SWHO", "uka_id": "UKA00650", "region": "South West", "pollutant": "PM2.5", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SWHO", "uka_id": "UKA00650", "region": "South West", "pollutant": "PM10", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 }, { "station_code": "SWHO", "uka_id": "UKA00650", "region": "South West", "pollutant": "NO2", "active_start": "2026-09-13", "period_end": "2026-10-12", "expected_station_days": 30 } ], "data_posture": "provisional and ratified official AURN automatic measurements, status flags preserved", "data_status_counts": { "contains_provisional": 9727 }, "provisional_or_as_supplied_pollutant_day_observations": 9727, "ratified_pollutant_day_observations": 0, "who_context_pollutant_day_observations": 282, "who_context_pollutant_day_observations_by_pollutant": { "NO2": 269, "PM10": 0, "PM2.5": 13 }, "provisional_or_as_supplied_station_days": 9727, "ratified_station_days": 0, "who_context_station_days": 282, "who_context_station_days_by_pollutant": { "NO2": 269, "PM10": 0, "PM2.5": 13 }, "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": 9727, "unique_station_days": 4216, "expected_configured_pollutant_day_observations": 9960, "configured_stream_day_completeness_percent": 97.7, "provisional_or_as_supplied_pollutant_day_observations": 9727, "ratified_pollutant_day_observations": 0, "who_context_pollutant_day_observations": 282, "who_context_pollutant_day_observations_by_pollutant": { "NO2": 269, "PM10": 0, "PM2.5": 13 }, "definitions": { "pollutant_day_observation": "One valid station/date/pollutant daily-mean row.", "unique_station_day": "One distinct station/date pair with at least one valid pollutant daily mean.", "configured_stream_day_completeness": "Valid pollutant-day observations divided by expected configured pollutant-day observations.", "who_context_pollutant_day_observation": "A valid pollutant-day observation above the pollutant-specific WHO 2021 24-hour contextual reference; not a UK legal exceedance." } }, "geographic_posture": "automatically discovered active English AURN station network; not population weighted and not a direct estimate of personal exposure", "claim_boundary": [ "descriptive observed concentrations and data completeness only", "no source attribution or causation", "no legal compliance determination", "no individual exposure or health-risk determination", "regional comparisons are shown only where the multi-station eligibility rule is met" ], "methodology": { "daily_minimum_hourly_observations": 18, "station_period_minimum_valid_days": 15, "regional_aggregation": "equal-weight median of valid station-daily means", "who_2021_24h_context_ug_m3": { "PM2.5": 15.0, "PM10": 45.0, "NO2": 25.0 }, "invalid_daily_reference_comparison": "null/not assessed", "changing_panel_sensitivity": "daily reporting station and region counts plus fixed-panel series", "time_basis": "GMT hour ending; daily aggregation uses the printed source calendar date", "hour_ending_24_rule": "24:00 is retained as next-day 00:00 UTC but aggregated to the printed source calendar date", "accepted_quality_status_flags": { "R": "ratified", "P": "provisional", "P*": "as supplied" } }, "licence": "© Crown copyright Defra via uk-air.defra.gov.uk, licensed under the Open Government Licence.", "generated_at_utc": "2026-10-13T08:42:14.610978+00:00", "station_discovery": { "method": "official active-site selector plus per-site AURN metadata pages", "discovered_active_english_sites": 172, "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": "7d47d6253e31417d32378e7dce218cd0b60458d6e655be878c68e8dc24ad44ac", "byte_count": 38323, "retrieved_at_utc": "2026-10-13T08:42:15.028827+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": "2026-10-13T08:42:18.809441+00:00" }, { "stage": "station_detail", "uka_id": "UKA00451", "url": "https://uk-air.defra.gov.uk/networks/site-info?uka_id=UKA00451", "http_status": 200, "sha256": "fc121f3d7a6bc6ccdc208ce53c91122ffd9e083bf082390200c5a8f16dcb8ecc", "byte_count": 102290, "retrieved_at_utc": "2026-10-13T08:42:19.208455+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": "4d47744789bea631059201dd7e6a84d76aab184343c45851898e6fe084e18b45", "byte_count": 28675, "retrieved_at_utc": "2026-10-13T08:42:20.280147+00:00" }, { "stage": "station_detail", "uka_id": "UKA00541", "url": "https://uk-air.defra.gov.uk/networks/site-info?uka_id=UKA00541", "http_status": 200, "sha256": 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"retrieved_at_utc": "2026-10-13T08:42:22.296428+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": "2026-10-13T08:42:22.807751+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": "2026-10-13T08:42:22.980994+00:00" }, { "stage": "station_detail", "uka_id": "UKA00660", "url": "https://uk-air.defra.gov.uk/networks/site-info?uka_id=UKA00660", "http_status": 200, "sha256": "d7e80603bd9fdb67ac7042803610547436bb39774c5bb33854cbfa2a3abcb649", "byte_count": 30969, "retrieved_at_utc": "2026-10-13T08:42:24.244995+00:00" }, { "stage": "station_detail", "uka_id": 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