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Hazardous Substances Clean Air Act Biden Administration

Williams Mullen

Is the Once in, Always in Policy Finally Dead?

Williams Mullen on

EPA’s controversial “Once in, always in, Rule” (Once in Rule) was recently rescinded under the Congressional Review Act, a statute which gives Congress the authority to overturn agency rules if such action is taken within...more

Vinson & Elkins LLP

EPA Proposes to Repeal Biden-era Regulations Governing Air Toxic Emissions from Coal- and Oil-Fired Power Plants

Vinson & Elkins LLP on

On June 17, 2025, the U.S. Environmental Protection Agency (“EPA”) published a proposed rule to repeal the amendments to the Mercury and Air Toxics Standards (“MATS”) adopted by the Biden administration in 2024. These...more

Allen Matkins

California Environmental Law & Policy Update 6.13.25

Allen Matkins on

The U.S. Environmental Protection Agency (EPA) moved this Wednesday to erase limits on greenhouse gases from power plants and to weaken restrictions on other hazardous power plant emissions, including mercury, arsenic, and...more

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