This measure would overturn an EPA decision that let California enforce several tougher rules on vehicle emissions. The EPA’s notice, published April 6, 2023, granted California a waiver so it could apply rules like Advanced Clean Trucks, Zero Emission Airport Shuttle, and other heavy‑duty vehicle warranty and maintenance standards. The resolution would nullify that EPA notice, removing federal approval for those California rules .

Under the Clean Air Act, California can ask for waivers to set its own emission standards despite federal limits. The EPA had granted that request; this measure would stop it, meaning those specific California rules could no longer rely on the federal waiver to be enforced .

• Who is affected: California regulators, truck and engine makers, trucking fleets, and airport shuttle operators in California (and potentially in states that follow California’s standards) .
• What changes: The EPA’s approval of California’s stricter heavy‑duty and zero‑emission rules would be canceled .
• When: If this measure becomes law, the EPA notice would be nullified at that time; the underlying California rules would lose the federal waiver they depend on .