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Pennsylvania
Bureau of Air Quality
Principal Pollutants
Air Quality Index (AQI) Reports
The AQI reports on five major air pollutants: ozone,
particulate matter, sulfur
dioxide, carbon monoxide
and nitrogen dioxide. An AQI
value is given for each monitoring site and pollutant. The overall
AQI for a site is the highest index value of any of the pollutants. As
levels of any or all of these air pollutants rise beyond health
standards, precautionary health warnings are triggered.
Color |
AQI |
Air Quality |
Green |
0-50 |
Good |
Yellow |
51-100 |
Moderate |
Orange |
101-150 |
Unhealthy for Sensitive Groups |
Red |
151-200 |
Unhealthy |
Purple |
201-300 |
Very Unhealthy |
Maroon |
>300 |
Hazardous |
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