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

The health department began deploying mobile air units Thursday provided by Pennsylvania’s Department of Environmental Protection and Carnegie Mellon University. The units will travel around Clairton to test for dozens of hazardous air pollutants.

The second person killed in Monday’s deadly explosion at the U.S. Steel Clairton Coke Works has been identified.

The large turnout was a reflection of the deep sense of loss and growing anger over unsafe conditions at the U.S. Steel plants.

Data from the EPA and OSHA provide a glimpse into some of the previous violations and injury reports at the Clairton Coke Plant over the past decade.

Regulators are temporarily stepping up pollution monitoring in the Mon Valley after a deadly explosion at U.S. Steel’s Clairton Coke Works on Monday sparked worry about the release of toxic gases. The

Clairton, Pennsylvania was rocked Tuesday by an explosion at the U.S. Steel Clairton Coke Works. Clairton Mayor Richard Lattanzi reflects on the sad day.

The first thing Andrew Macey thought about as he arrived at work at the Clairton Coke Works on Tuesday morning were the cars that remained.