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; Heavy-Duty Vehicle and Engine Emission Warranty and Maintenance Provisions; Advanced Clean Trucks; Zero Emission Airport Shuttle; Zero-Emission Power Train Certification; Waiver of Preemption; Notice of Decision".

Senate Joint Resolution 46 would overturn an Environmental Protection Agency decision from April 2023 that granted California a waiver under the Clean Air Act. This waiver allows California to establish its own stricter emission standards for heavy-duty vehicles and engines, including regulations on emission warranties and maintenance provisions for advanced clean trucks and zero-emission vehicles. If enacted, this resolution would prevent California from implementing these stricter pollution control standards, meaning the state would be unable to enforce its own vehicle emission rules that go beyond federal standards.

Under the Clean Air Act, California has special authority to request waivers that allow it to set emission standards more stringent than federal requirements. This resolution seeks to eliminate that approved waiver. The practical effect for citizens would depend on where they live and work: California residents and businesses would be subject to federal emission standards rather than California's stricter standards, potentially affecting air quality and vehicle regulations in the state. The resolution is currently in the early stages of the legislative process and has been referred to committee for consideration.