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Air Quality

The Air District monitors air quality in the nine Bay Area counties and issues a daily forecast.  This forecast uses the U.S. EPA's color-coded Air Quality Index, or AQI, to indicate pollution levels.

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Air Quality Forecast

The Bay Area Air District issues air quality forecasts every day. These forecasts use the Air Quality Index, or AQI, a color-coded number scale developed by the U.S. EPA to give easy-to-understand information about daily air pollution levels - kind of like an air quality “thermometer.”

The daily air quality forecast divides the Bay Area counties into five reporting zones, and reports the AQI level for the particular pollutant anticipated to reach the most unhealthy concentration in each reporting zone.

In preparing the daily air quality forecast, Air District meteorologists study weather patterns that influence air pollution, and analyze measurements from the agency’s air quality monitoring network.

You can also get the daily air quality forecast by calling the Air District’s 24-hour toll-free information line, 1-800-HELP AIR, or by signing up for EnviroFlash e-mail AirAlerts.

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