{"@context":"https://schema.org","@type":"Dataset","@id":"https://zipradar.org/topic/air-quality/50309/","name":"Air quality for ZIP 50309 — Des Moines, IA","description":"Air quality data for ZIP 50309 (Des Moines, Iowa), sourced from EPA AirNow.","topic":{"slug":"air-quality","label":"Air quality","source":"EPA AirNow","sourceUrl":"https://www.airnow.gov/","refreshCadence":"Hourly real-time / daily historical","summary":"Pages show the current AQI category (Good, Moderate, Unhealthy for Sensitive Groups, Unhealthy, Very Unhealthy, Hazardous), the nearest reporting station, and historical averages.","limitations":"Rural ZIPs may not have a nearby monitoring station; zipradar then reports the closest available station with distance context."},"place":{"zip":"50309","city":"Des Moines","state":"IA","stateFull":"Iowa","county":"Polk County","countySlug":"polk-county","geo":{"latitude":41.5868,"longitude":-93.625}},"stateContext":{"topConcern":"Radon Zone 1, agricultural water nitrates","narrative":"Iowa is one of the highest-radon states in the US — uniformly Zone 1. Agricultural runoff drives EPA SDWIS nitrate violations in small rural systems and even Des Moines Water Works. Tornadoes peak April-June."},"datePublished":"2026-04-24","dateModified":"2026-05-13","canonicalUrl":"https://zipradar.org/topic/air-quality/50309/","zipDashboardUrl":"https://zipradar.org/zip/50309/","zipDashboardApiUrl":"https://zipradar.org/api/zip/50309/","primarySourceUrl":"https://www.airnow.gov/","license":{"content":"CC-BY-4.0","attribution":"zipradar.org — https://zipradar.org/topic/air-quality/50309/"}}