fuel economy/efficiency standards

Supply-Side Regulations & Clean Vehicles

As Congress votes to undermine California’s sovereignty to set supply-side standards on polluting vehicles, CLEE’s research shows why these policies are so effective

In May 2025, both the U.S. House and Senate passed resolutions to revoke California’s Clean Air Act waivers, which allow the state to enforce stricter vehicle emissions rules than federal standards (see Ann Carlson’s post on this issue). If signed by the President—and if successful in the face of court challenges to their dubious legality—these …

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