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(opens in a new tab)
Southwest PA(opens in a new tab)
Central PA(opens in a new tab)
Northeast PA(opens in a new tab)
Lehigh Valley(opens in a new tab)
Susquehanna(opens in a new tab)
Southeast PA(opens in a new tab)
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 |