New study tracks Pennsylvania’s top 12 polluters, and nearly half are in the Pittsburgh region

PITTSBURGH — PennEnvironment Research & Policy Center’s latest tally of the state’s industrial facilities that emit the most greenhouse gases found that the top 12 emitters accounted for about a fifth of Pennsylvania’s pollution.

The “Dirty Dozen” report released Tuesday finds that there were 45.8 million metric tons of greenhouse gases that were released into the atmosphere in 2021 by the 12, of which all but one were power plants. The top three were in western Pennsylvania and all coal-fired power plants: Keystone Generating Station in Armstrong County, Conemaugh Generating Station in Indiana County, and the Homer City Generating Station in Indiana County. The Homer City plant is to be closed by the end of June. The three power plants had combined direct emissions of about 18 million tons in 2021.

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