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Compare Air Quality

Compare air quality trends, grades, and pollutants between any two US cities.

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AirHistory

10-year air quality trends for every US city. Data from EPA Air Quality System (AQS), updated annually.

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Pollutants

PM2.5 Trends Ozone Trends NO2 Trends CO Trends PM10 Trends

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Data sourced from EPA Air Quality System (AQS). Not affiliated with the US Environmental Protection Agency.