{"@context":"https://schema.org","@type":"Dataset","@id":"https://zipradar.org/topic/air-quality/59802/","name":"Air quality for ZIP 59802 — Missoula, MT","description":"Air quality data for ZIP 59802 (Missoula, Montana), sourced from EPA Air Quality System (AQS), annual county summary.","topic":{"slug":"air-quality","label":"Air quality","source":"EPA Air Quality System (AQS), annual county summary","sourceUrl":"https://aqs.epa.gov/aqsweb/airdata/download_files.html","refreshCadence":"Annual (EPA AQS publication)","summary":"Pages show the 2025 median AQI category (Good, Moderate, Unhealthy for Sensitive Groups, Unhealthy, Very Unhealthy, Hazardous) for the ZIP's county, plus the year's max/90th-percentile AQI and day-count breakdown by category.","limitations":"This is a county-level ANNUAL SUMMARY, not a live current reading and not an address-level measurement — for today's AQI, EPA's real-time AirNow feed is the correct source (not yet federated here). Not every county operates an EPA monitor; absence of data for a ZIP's county means no 2025 EPA reading exists, not that air is good."},"place":{"zip":"59802","city":"Missoula","state":"MT","stateFull":"Montana","county":"Missoula County","countySlug":"missoula-county","geo":{"latitude":46.8721,"longitude":-113.994}},"stateContext":{"topConcern":"Radon Zone 1, wildfire","narrative":"Montana is uniformly Zone 1 radon. Wildfire risk concentrates in the western mountains; the 2017 + 2021 + 2024 seasons all set records. EPA SDWIS shows compliance disparity between Helena/Missoula/Billings and small rural systems."},"radonZone":null,"airQuality":{"year":2025,"medianAqi":38,"medianCategory":"Good","maxAqi":98,"p90Aqi":56,"daysWithAqi":365,"goodDays":298,"moderateDays":67,"usgDays":0,"unhealthyDays":0,"veryUnhealthyDays":0,"hazardousDays":0,"classification":"county-level ANNUAL summary — not a live current reading, not an address-level measurement","caveat":"This is a county-level ANNUAL SUMMARY for 2025, not a live current reading. For today's air quality, check a real-time monitor at airnow.gov. Categories follow EPA's official AQI breakpoints."},"waterQuality":null,"datePublished":"2026-04-24","dateModified":"2026-09-24","canonicalUrl":"https://zipradar.org/topic/air-quality/59802/","zipDashboardUrl":"https://zipradar.org/zip/59802/","zipDashboardApiUrl":"https://zipradar.org/api/zip/59802/","primarySourceUrl":"https://aqs.epa.gov/aqsweb/airdata/download_files.html","license":{"content":"CC-BY-4.0","attribution":"zipradar.org — https://zipradar.org/topic/air-quality/59802/"}}