Flag Colors and Recommended Activity

Flags posted at participating schools and/or community organizations match AQI’s warning level colors, indicating the amount of pollution in the air and any possible associated health effects experienced within a few hours or days after breathing polluted air. ADEQ and some local districts calculate the AQI for four major air pollutants regulated by the Clean Air Act: ground-level ozone, PM10, PM2.5 and carbon monoxide | Learn More About Pollutants >

For each of these pollutants, the Environmental Protection Agency (EPA) has established National Air Quality Standards to protect public health. If a warning is issued, the flag’s purpose is to protect the greater at-risk population.

Flag Colors

GreenAir quality is good. Great day to be active outside!

Yellow — Air quality is acceptable, but there might be health concerns for some of the population. Good day to be active outside. People who are unusually sensitive to air pollution could experience symptoms and may need to take a break, participate in less intense activities, stop all activity, go indoors or use quick-relief medicine as prescribed. If symptoms don’t improve, get medical help.

Orange — Air quality is unhealthy for sensitive groups, including people with lung or cardiac disease, children, outdoor athletes and older adults. It’s okay to be active outside, especially for short activities or less intense activities. For longer activities, such as sports games, take more breaks. Watch for symptoms and take action as needed, such as taking a break, participating in less intense activities, stopping all activity, going indoors or using quick-relief medicine as prescribed. If symptoms don’t improve, get medical help. People with asthma should follow their asthma action plans and keep quick-relief medicine handy.

Red — Air quality is unhealthy. Everybody may begin to feel some health effects. Outdoor activity should be limited for all children, and sensitive individuals should stay indoors. For all outdoor activities, take more breaks and participate in less intense activities. Consider moving longer or more intense activities indoors or rescheduling them to another day or time. Watch for symptoms and take action as needed. If symptoms occur, you may need to take a break, participate in a less intense activity, stop all activity, go indoors or use quick-relief medicine as prescribed. If symptoms don’t improve, get medical help. People with asthma should follow their asthma action plans and keep their quick-relief medicine handy.