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 and Nonroad Engine Pollution Control Standards; The 'Omnibus' Low NOx Regulation; Waiver of Preemption; Notice of Decision".

S.J.Res. 47 is a binding joint resolution that would overturn an Environmental Protection Agency decision from January 2025. The EPA decision granted California's request for a waiver allowing the state to enforce its Heavy-Duty Vehicle and Engine Omnibus Low NOx regulations, which set stricter pollution control standards for vehicles than federal requirements. Under the Clean Air Act, California has the ability to seek such waivers from federal preemption rules that normally prevent states from setting their own emission standards.

If enacted, this resolution would eliminate California's authority to enforce these stricter emission standards, meaning vehicles sold in California would only need to comply with federal pollution standards rather than California's more stringent requirements. This could affect vehicle manufacturers and consumers in California, as well as the state's ability to address air quality and climate concerns through vehicle emission regulations. The resolution is currently in the early stages of the legislative process and has not yet been voted on by the full Senate.