The National Weather Service reported an air quality alert at 9 a.m. on Monday in effect until 7 p.m. for Allegheny County.

On Monday at 3:30 p.m. the National Weather Service reported an air quality alert in effect until Wednesday at midnight for ...

An Air Pollution Watch has been issued for the Mon Valley. The Allegheny County Health Department advises the watch will last ...

Matt Fuchs lives in Maryland and writes about health, science, and technology. Matt Fuchs lives in Maryland and writes about health, science, and technology. When George Thurston leaves his cottage in ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. The U.S. Air Quality Index (AQI) is the ...

The agency missed a Saturday deadline to determine which parts of the country are flunking the tightened 2024 rule for soot exposure.

On Friday at 3:09 p.m. an air quality alert was reported by the National Weather Service in effect until Saturday at noon for ...