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CNN: When the EPA rolled back mercury regulations, it left this community in the path of pollution

The EPA removed a Biden-era mercury emissions rule for lignite plants, raising health concerns for nearby Northern Cheyenne communities due to increased toxic pollution.

  • Rescinding the Biden mercury rule, the EPA last year granted Colstrip power plant a waiver to bypass it, according to the agency.
  • After years of nationwide cuts, Biden EPA's 2024 regulation aimed to close the lignite carveout, which was granted last year despite mercury emissions from over 30 lignite-burning plants.
  • The Colstrip power plant emitted nearly 60 pounds of mercury last year and lacks basic pollution-control technologies, according to EPA-mapped data.
  • Northern Cheyenne leaders say Colstrip provides local jobs and tribal air monitoring funding, but mercury and toxins pose risks to pregnant women, babies and small children.
  • Despite affecting a small number of plants, experts warn the rollback could have big implications for affected communities like the Northern Cheyenne, as more than 90% of the rest of the coal fleet reduced mercury emissions by 80 or 90%.
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CNN broke the news in Atlanta, United States on Wednesday, March 18, 2026.
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