{"@context":"https://schema.org","@type":"Dataset","@id":"https://zipradar.org/topic/air-quality/19711/","name":"Air quality for ZIP 19711 — Newark (DE), DE","description":"Air quality data for ZIP 19711 (Newark (DE), Delaware), 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":"19711","city":"Newark (DE)","state":"DE","stateFull":"Delaware","county":"New Castle County","countySlug":"new-castle-county","geo":{"latitude":39.6837,"longitude":-75.7497}},"stateContext":{"topConcern":"Sea-level rise, agricultural runoff","narrative":"Delaware has the lowest mean elevation of any US state and FEMA NFHL coverage extends well inland in Sussex County. Agricultural runoff in poultry-heavy regions affects EPA SDWIS small-system nitrate readings. Lead-service-line inventories statewide are nearing 2024 LCRR baseline."},"radonZone":null,"airQuality":{"year":2025,"medianAqi":44,"medianCategory":"Good","maxAqi":161,"p90Aqi":67,"daysWithAqi":365,"goodDays":235,"moderateDays":126,"usgDays":3,"unhealthyDays":1,"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."},"datePublished":"2026-04-24","dateModified":"2026-09-07","canonicalUrl":"https://zipradar.org/topic/air-quality/19711/","zipDashboardUrl":"https://zipradar.org/zip/19711/","zipDashboardApiUrl":"https://zipradar.org/api/zip/19711/","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/19711/"}}