USS-Edgar Thomson Plant

U.S. Steel’s Edgar Thomson Plant is the tenth-most toxic air polluter in Allegheny County. There are 89,114 people within three miles of the plant. Six schools are within one and a quarter mile of the plant, including Fairless Elementary School, Homeville Elementary School and West Mifflin Area Middle School.

The Edgar Thomson Plant is a steel production facility located in Braddock and is part of U.S. Steel’s Mon Valley Works. The plant has a decades-long history of clean air violations. In 2019, for example, the Allegheny County Health Department found that emissions of sulfur dioxide from the plant were endangering public health. The county then issued an enforcement order for U.S. Steel to reduce plant emissions. The emissions occurred after a fire at U.S. Steel’s Clairton Coke Works forced the diversion of high-sulfur coke oven gas to the Edgar Thomson and Irvin facilities, where gases were then released from flaring stacks.

In 2016, air pollution from the plant included 36,100 pounds of ammonia, a pollutant that affects the respiratory system; 3,500 pounds of manganese, a pollutant that affects the nervous system; and more than 300 pounds of lead, which causes neurological problems and can affect the nervous system.

Image: Mark Dixon via Flickr (CC BY 2.0)

Health EffectsChemicals
CancerLead Compounds, Chromium Compounds, Nickel Compounds
Cardiovascular System ImpactsLead Compounds
Nervous System ImpactsMercury Compounds, Manganese Compounds, Lead Compounds
Respiratory System ImpactsAmmonia, Chromium Compounds, Copper Compounds, Manganese Compounds, Nickel Compounds, Vanadium Compounds

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