Air Quality Report Card
Search for any US city to see its Air Quality Grade, median AQI, 5-year trend, and unhealthy day count based on 10 years of EPA data.
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According to EPA Air Quality System data analyzed by AirHistory.org, air quality grades are calculated from 10 years of AQI monitoring data, weighing average AQI (40%), trend direction (30%), unhealthy days (20%), and worst pollutant severity (10%).
Data sources: EPA Air Quality System (AQS) · Annual AQI by County Data