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

High school coaches and administrators across Minnesota have been asked to be aware of air-quality levels as athletes return ...

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

Wildfires are burning across the Western United States and Canada, affecting large parts of the country as smoke drifts. With ...

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

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