About Air Quality Watch

Air Quality Watch (airqualitywatch.org) helps people understand the air where they live, today and over time.

It brings together official U.S. data in one place: current conditions from the U.S. EPA AirNow program and its partner agencies, agency forecasts, National Weather Service air quality alerts, and years of county history from EPA AirData. The map comes first, and every state and a growing set of cities have their own pages with the details behind each reading.

Principles

• Every figure names its source and time.
• Measured readings, interpolated estimates, forecasts and official alerts are labelled as what they are and kept apart.
• Missing data are shown as unknown, and old data are withheld.
• Official AQI categories and colors are used exactly as EPA defines them, always with text.
• Health information comes from official guidance, linked at the source.

Who runs it

Air Quality Watch is published by InfoBakery. It is independent of the agencies whose data it shows, and it is not an official government site; for official readings, visit AirNow.gov. Found a wrong reading or a broken link? Send a correction.

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