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Air Quality Index
(AQI) values
Levels of Health
When the AQI
is in this range:
...air quality conditions are: 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
Figure 14: Air Quality Index (AQI) levels of health concern. This color-coded table shows generically how AQI values correlate with levels of health concern. For a copy of this AQI table, download the booklet, "Air Quality Index - A Guide to Air Quality and Your Health," that explains the AQI and the health effects of major air pollutants, at (629KB, 12 pp.)