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 ...

While the smoke is worst along the Western Slope where the fires are burning, levels are also fluctuating on the Front Range.

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

An air quality alert was reported by the National Weather Service on Tuesday at 12:17 p.m. in effect until 8 p.m. for ...

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 ...