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.
Northwest PA
Southwest PA
Central PA
Northeast PA
Lehigh Valley
Susquehanna
Southeast PA
Please click on the county groups for AQI reports in that area. The AQI reports are updated hourly at half-past the hour.
The AQI reports use the following key to describe Air Quality
| 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 |
Helpful Links
- Forecasts