California Auto Emissions Waiver Battles (1970-Present)
Clean Air Act granted California unique authority to set vehicle emissions standards stricter than federal rules. EPA must approve waivers; 17 states adopted California standards. Trump administration revoked waivers in 2019; Biden restored them in 2021; Trump revoked again in 2025 using Congressional Review Act. Eleven states sued to invalidate the 2025 rescission.
Litigation continues for years; automotive industry lobbies for federal uniformity.
California standards effectively became national as automakers built to strictest requirements rather than maintaining separate production lines.
Shows how large state markets (California = 12% of U.S. economy) can set de facto national standards even amid federal opposition—exactly what's at stake with AI regulation.
