The air monitor generates a beam of infrared light, shoots it down to that mirror, which causes it to bounce back.

In the last five years, U.S. Steel has paid more than $10 million in penalties for violations of the Clean Air Act at ...

The plant, a massive industrial facility along the Monongahela River south of Pittsburgh, is considered the largest coking ...

Family members tell Pittsburgh's Action News 4 Steven Menefee, a father of two, was a loving man who would give you the shirt ...

Allegheny County is boosting air monitoring after a deadly explosion at U.S. Steel’s Clairton Coke Works, a plant with a ...

U.S. Steel says it believes a gas valve failure led to the explosion Monday morning at its Clairton Coke Works, in which two ...

The deadly blast at the U.S. Steel facility outside Pittsburgh was just the latest in a series of recent workplace accidents.

Neighbors of U.S. Steel's Clairton Coke Works and the plants' workers react to the explosion at the plant on Monday that ...

Workers were heating coal and preparing for routine maintenance when an explosion rocked a U.S. Steel plant outside ...