Overview

• Administrator Lee Zeldin unveiled the proposal on July 29 in Indianapolis, calling it the largest deregulatory action in U.S. history.
• The draft rule would repeal the 2009 endangerment finding that defines carbon dioxide and five other greenhouse gases as public health hazards under the Clean Air Act.
• It targets tailpipe emission standards that underpin electric vehicle mandates and limits on light-, medium- and heavy-duty vehicles.
• The agency will accept public comments on the proposal for 45 days before a final decision, with environmental groups and former EPA leaders promising legal challenges.
• Critics warn that reversing the finding undermines scientific consensus, threatens air quality protections and could block future federal climate regulations.