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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.

Northwest PASouthwest PACentral PANortheast PALehigh ValleySusquehanna ValleySoutheast 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

Northwest PA
Southwest PA
Central PA
Northeast PA

Lehigh Valley
Southeast PA



Air Quality









 Unhealthy for Sensitive Groups






 Very Unhealthy




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