Poor Air Quality and What you can do
Air Quality affects health, especially that of individuals with heart or lung disease. The Air Quality Index (AQI) tells us how clean the air is and whether it could affect our health. EPA, together with state and local agencies, forecasts and reports on current conditions for ozone and particle pollution.
What you can do:

Check the Air Quality Index (AQI) daily. If you cannot access the Internet to check it, consult your local newspaper, tv or radio weather broadcasts for daily ozone and/or particle pollution forecasts.
On bad air days (Code Orange, Red, Purple or Maroon), limit or reschedule outdoor activity.
Source: epa.gov