Senate bill would strip California's authority to enforce tighter truck emission rules
In committeeS.J.Res. 47Latest action
Sponsor: Markwayne Mullin · Senator · OK
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Official title: 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".
119th Congress
Topics: Environment & energy
Introduced:
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SJRES 47 would cancel the EPA waiver letting California enforce its strict NOx truck rules, affecting California and states that follow its standards.
55-second read · 4 questions answered below
What does this do?
SJRES 47 uses the to cancel an EPA waiver granted in January 2025 that allowed California to enforce its own stricter nitrogen oxide (NOx) emission rules for heavy-duty trucks and diesel engines. Without the waiver, California's "Omnibus Low NOx" regulation would become unenforceable. Other states that had adopted California's stricter standards in place of the federal standard would also likely be affected.
Who does it affect?
Trucking companies, diesel engine manufacturers, and freight operators doing business in California and any states following California's emission rules are most directly affected. California residents and residents of other adopting states who would otherwise have seen air quality improvements are also affected.
Why does it matter?
NOx pollution contributes to smog and respiratory health problems, and the stricter standards were designed to reduce those effects. Revoking the waiver removes the legal basis for enforcing those reductions in California and likely in states that follow its rules. Engine requirements tied to cleaner standards can also influence the cost and availability of heavy-duty trucks and the goods they transport.
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Where does it stand?
- IntroducedApr 4, 2025
- Senate committeeYou are here · Apr 4, 2025
- Senate vote
- House
- The president's desk
Right now: a Senate committee is reviewing it. If the House changes it, it goes back to the Senate before reaching the president.
Latest action: — Read twice and referred to the Committee on Environment and Public Works.