Allegheny County is increasing air quality monitoring after an explosion at a U.S. Steel plant south of Pittsburgh killed two ...

The Trump administration is backing a trucking industry lawsuit against the state’s plan to lower emissions and switch to electric vehicles.

Official air-quality results for Kyrene de la Sierra Elementary School show elevated levels of potentially harmful chemicals.

The health department began deploying mobile air units Thursday provided by Pennsylvania’s Department of Environmental ...

While not everyone will be impacted by air quality on Wednesday, those who have been sensitive to poor air quality this ...

The City Council dropped a $202 million effort that would have expanded the city’s cooling centers to also accommodate people ...