Allegheny County is increasing air quality monitoring after an explosion at a U.S. Steel plant south of Pittsburgh killed two people and injured more than 10 others

The Allegheny County Health Department announced that Mobile Air Units will be deployed in the Mon Valley Thursday and Friday as part of an ongoing investigation into the deadly explosion at the U.S.

U.S. Steel Clairton Coke Works' current limited coke-making capacity due to Monday's explosion is prompting concerns.