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Air Quality Index
(AQI) Values		 Levels of Health Concern Colors
When the AQI
is in this range:		 ...air quality conditions are: ...as symbolized
by this color:
0 to 50 Good Green
51 to 100 Moderate Yellow
101 to 150 Unhealthy for
Sensitive Groups		 Orange
151 to 200 Unhealthy Red
201 to 300 Very Unhealthy Purple
301 to 500 Hazardous Maroon

Air Quality Index
Levels of Health Concern
Numerical
Value
Meaning
Good 0-50 Air quality is considered satisfactory, and air pollution poses little or no risk.
Moderate 51-100 Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.
Unhealthy for
Sensitive Groups		 101-150 Members of sensitive groups may experience health effects. The general public is not likely to be affected.
Unhealthy 151-200 Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.
Very Unhealthy 201-300 Health alert: everyone may experience more serious health effects.
Hazardous > 300 Health warnings of emergency conditions. The entire population is more likely to be affected.