Hi there!
The Air Quality Index (AQI) is an index to help us understand how healthy it is to be outside where you are. When outdoor air quality conditions are unhealthy, we can consider modifying activities, wearing a mask, or staying indoors to mitigate the negative effects of unhealthy air.
AirNow has an excellent website and mobile app. Check out AirNow.gov.
Dowload the Environmental Protection Agency (EPA) AirNow mobile app, enter your locations, and turn on notification for forecasts.