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.

A devoted dad has been identified as one of the two steel workers killed from an explosion at a Pennsylvania steel plant on Monday, officials said.

Steelworkers at US Steel’s Clairton Coke Works have come forward to expose the long-standing and deadly safety hazards that preceded Monday’s explosion, which killed Timothy Quinn and Steven Menefee and injured ten others.