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Clean Air Act


Supreme Court Limits EPA Authority to Regulate Power Plant Emissions

The U.S. Supreme Court has curbed the Environmental Protection Agency’s (EPA’s) options for limiting emissions of greenhouse gases (GHG) from power plants, an important environmental decision that could impact the…


Montana District Court Vacates EPA's 'Secret Science' Rule

The Environmental Protection Agency's (EPA's) "Secret Science" rule establishing new standards for consideration of certain "pivotal" scientific studies, which was slated to go into effect on Jan. 6 of this…


EPA Reinterprets ‘Ambient Air,’ Further Tweaks New Source Review 

The Environmental Protection Agency (EPA) has finalized a change to a long-standing policy interpreting “ambient air”—a foundational concept under the Clean Air Act that applies to all types of air…


EPA’s Final Regional Haze Guidance Highlights State Discretion, Flexibility

New guidance issued by the Environmental Protection Agency (EPA) on Aug. 20 to help states prepare for the second implementation period of the federal regional haze program puts emphasis on…


Clean Air Act Issues Congress Could Grapple With in New Session
emissions-carbon-dioxide

While the Republican-led U.S. House and Senate in the 115th Congress was mainly focused on reviewing, for modification or repeal, several environmental rules issued under the Clean Air Act (CAA),…