A joint resolution providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Environmental Protection Agency relating to "California State Motor Vehicle and Engine Pollution Control Standards; Advanced Clean Cars II; Waiver of Preemption; Notice of Decision".

Senate Joint Resolution 45 seeks to overturn an Environmental Protection Agency decision issued in January 2025 that granted California a waiver to enforce its Advanced Clean Cars II regulations. Under the Clean Air Act, California has special authority to set its own vehicle emission standards that are stricter than federal requirements, but must obtain a waiver from the EPA to do so. This resolution would use the Congressional Review Act to disapprove the EPA's decision to grant that waiver.

If enacted, this resolution would prevent California from implementing its Advanced Clean Cars II standards, which appear to relate to emissions requirements for hybrid, electric, and advanced technology vehicles. This would mean California would have to follow federal emission standards instead of its own stricter rules. The resolution is currently in the Senate and has not yet been voted on by the full chamber. It is worth noting that as a binding joint resolution, it would have the force of law if passed and signed by the President, unlike non-binding resolutions.