U.S. Steel

Air quality monitors did not detect "any adverse conditions" after the outage, and health department officials said they believe the outage "will either not affect or only minimally affect" emissions from the Mon Valley plant.

A new report provides a road map and emissions data for Pittsburgh suburbs that want to reduce their greenhouse gas emissions. Together the 35 communities emit more greenhouse gases than Pittsburgh.

The air quality in the Mon Valley should start to get a little better on the very worst days. That’s thanks to a new rule by the Allegheny County Health Department. The rule was passed last year but it took months to get U.S. Steel, the largest polluter in the region, to come up with a plan that would work. The rule has already gone into effect several times this year.

U.S. Steel has agreed to pay a $1.5 million fine from U.S. EPA and Allegheny County for alleged violations of pollution controls at its Edgar Thomson steel works near Pittsburgh.

The rule would limit how much pollution comes from coke ovens, the primary source of emissions at the coke works. U.S. Steel supports the new rule. But air quality activists say it doesn’t go far enough.

The Allegheny County Health Department will fine U.S. Steel more than $4.5 million for air quality enforcement issues at the company’s Clairton Coke Works, the department announced on Thursday.

The county’s study showed excess pollution levels 'entirely' caused by Clairton coke works.

Clairton residents and environmental advocates want the Allegheny County Health Department to impose stricter pollution limits on U.S. Steel's Clairton Coke Works.

A hearing officer has sided with U.S. Steel in the company’s challenge to Allegheny County’s proposed coke oven regulations.

The new livestream is set on the nest of parents Irvin and Claire and their growing family. It's located at U.S. Steel's Mon Valley Works Irvin Plant in West Mifflin.