{"groups":[{"group_name":"Unhealthy in CA","group_summary":"Four zones reach Unhealthy, with the national worst zone in California. PM2.5 is dominant; sensitive people and the public face elevated health risks."},{"group_name":"Mostly Good Air","group_summary":"Good conditions cover 4.52 million km², about 87% of mapped area. PM2.5 leads, with an average AQI near 24."},{"group_name":"Moderate Northwest","group_summary":"Moderate air covers 642,000 km², including ID, MT, OR and WA. PM2.5 dominates, averaging AQI 63 and affecting broader populations."},{"group_name":"Sensitive-Group Risk","group_summary":"Ten zones are Unhealthy for Sensitive Groups across about 20,862 km². PM2.5 averages AQI 127, requiring added caution for vulnerable people."},{"group_name":"PM2.5 Dominates","group_summary":"PM2.5 is the dominant pollutant in every category, making fine-particle exposure the main national air-quality concern."},{"group_name":"Broad Regional Coverage","group_summary":"The surface includes 59 zones monitored by 3,887 stations across 5.19 million km², supporting a wide national view with localized hotspots."}],"briefing_sections":[{"title":"Pollution Pattern","facts":[{"label":"Dominant parameters","value":"pm25","detail":null,"detail_display":null,"tone":"default","item_ref":null}]},{"title":"Surface Coverage","facts":[{"label":"Mapped area","value":"5,191,393 km2","detail":null,"detail_display":null,"tone":"default","item_ref":null},{"label":"Largest zone area","value":"2,228,984 km2","detail":null,"detail_display":null,"tone":"default","item_ref":null},{"label":"Surface run","value":"Aug 22, 2026, 12:20 PM UTC","detail":null,"detail_display":null,"tone":"default","item_ref":null},{"label":"Largest surface zone","value":"Good - AL, CT, DC +27 - 2,228,984 km2","detail":null,"detail_display":null,"tone":"default","item_ref":{"family":"airQuality","id":"aqz_Good_CA,US_0_410c3d5edae97fa2","kind":"air_quality_surface_zone"}}]}],"stats":{"surface_zone_count":59,"total_area_km2":5191392.727302234,"worst_category":"Unhealthy","worst_air_quality_surface_zone_id":"aqz_Unhealthy_CA,US_3_e5fd6f3ffd3c90de","dominant_parameters":["pm25"],"stations":3887,"max_area_km2":2228984.1978624905,"run_completed_at":"2026-08-22T12:20:57.991647Z","category_breakdown":[{"category":"Good","count":23,"area_km2":4518443.097141291,"aqi_max":50,"aqi_avg":24.117,"dominant_parameters":["pm25"]},{"category":"Moderate","count":22,"area_km2":641504.0827465089,"aqi_max":100,"aqi_avg":62.663,"dominant_parameters":["pm25"]},{"category":"Unhealthy for Sensitive Groups","count":10,"area_km2":20861.78736421047,"aqi_max":150,"aqi_avg":126.5652,"dominant_parameters":["pm25"]},{"category":"Unhealthy","count":4,"area_km2":10583.760050225306,"aqi_max":200,"aqi_avg":165.446,"dominant_parameters":["pm25"]}],"top_zones":[{"air_quality_surface_zone_id":"aqz_Good_CA,US_0_410c3d5edae97fa2","category":"Good","area_km2":2228984.1978624905,"aqi_avg":24.11696825511901,"dominant_parameter":"pm25","available_parameters":["co","no2","o3","pm10","pm25","so2"],"state_abbrs":["AL","CT","DC","DE","FL","GA","IA","IL","IN","KY","MA","MD","ME","MI","MN","MO","MS","NC","NH","NJ","NY","OH","PA","RI","SC","TN","VA","VT","WI","WV"]},{"air_quality_surface_zone_id":"aqz_Good_CA,MX,US_1_9034779d91aeb353","category":"Good","area_km2":747725.5141798772,"aqi_avg":24.11696825511901,"dominant_parameter":"pm25","available_parameters":["co","no2","o3","pm10","pm25","so2"],"state_abbrs":["AZ","CA","NV","OR","UT","WA"]},{"air_quality_surface_zone_id":"aqz_Good_US_2_52e3f4446becec44","category":"Good","area_km2":545880.7710063165,"aqi_avg":24.11696825511901,"dominant_parameter":"pm25","available_parameters":["co","no2","o3","pm10","pm25","so2"],"state_abbrs":["AZ","CO","ID","MT","NM","NV","UT","WY"]},{"air_quality_surface_zone_id":"aqz_Good_US_3_5f318a4bd861d2c9","category":"Good","area_km2":286784.8129458603,"aqi_avg":24.11696825511901,"dominant_parameter":"pm25","available_parameters":["co","no2","o3","pm10","pm25","so2"],"state_abbrs":["AR","KS","LA","MO","OK","TX"]},{"air_quality_surface_zone_id":"aqz_Moderate_CA,US_0_409702fd2862ea7d","category":"Moderate","area_km2":239142.3144197551,"aqi_avg":62.663027618088044,"dominant_parameter":"pm25","available_parameters":["co","no2","o3","pm10","pm25","so2"],"state_abbrs":["ID","MT","OR","WA"]}]},"created_at":"2026-08-22T12:21:16.349488Z","model":"gpt-5.6-luna","usage":{"input_tokens":1373,"input_tokens_details":{"cache_write_tokens":0,"cached_tokens":0},"output_tokens":380,"output_tokens_details":{"reasoning_tokens":101},"total_tokens":1753},"message":null,"country_code":"US","state_abbr":null,"view":"surface_zones","tiles_version":14194,"tiles_updated_at":"2026-08-22T12:21:10.085920Z"}