The Air Quality Flag Program fact sheet explains how communities, schools, and organizations can implement a flag system corresponding to the U.S. Environmental Protection Agency's (EPA) Air Quality Index (AQI) to visually communicate daily air quality conditions. The flag program helps people take precautions and modify their outdoor activities as needed to reduce their exposure to air pollution, especially during poor air quality days. Users can sign up for AQI forecasts and notifications to know which flag color to fly each day.

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AirNow is a partnership of the U.S. Environmental Protection Agency (EPA), National Oceanic and Atmospheric Administration (NOAA), National Park Service, NASA, U.S. Centers for Disease Control and Prevention (CDC), and tribal, state, and local air quality agencies.