The School Flag Program uses brightly colored flags to help children, parents, school personnel, and the community to be aware of daily air quality conditions.

Participating schools raise a colored flag each day that corresponds to their local air quality forecast according to the Air Quality Index, which tells how clean or polluted the air is for that day. When members of the school and the surrounding community know what the daily air quality is, they can adjust their activities to reduce their exposure to air pollution. The purpose of the school flag program is to help children continue to exercise while reducing the risk of suffering an asthma attack.