If the air quality is under 100; Air quality is considered acceptable; however, if you are exposed for 24 hours there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.
If the air quality is between 100-150; members of sensitive groups may experience health effects if they are exposed for 24 hours. The general public is not likely to be affected.
If the air quality is between 150-200; Everyone may begin to experience health effects if they are exposed for 24 hours.
If the air quality is over 200; Health alert. Everyone may experience more serious health effects if they are exposed for 24 hours.