Stop CARB Act of 2025
Sponsored By: Representative Nehls
Introduced
Summary
Removes California's special authority to set vehicle and engine emission rules. This bill would end the Clean Air Act waiver process and bar any State or local government from adopting or enforcing emissions standards for nonroad engines or nonroad vehicles that go beyond or conflict with federal standards.
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- California state agencies and the California Air Resources Board would lose the waiver pathway and the Section 177 authority to adopt separate motor vehicle standards.
- All waivers issued under Clean Air Act section 209(b) before enactment would be terminated and pending waiver applications would be denied.
- Manufacturers of construction equipment, farm vehicles, and locomotive engines would face only federal standards rather than a separate California set of rules.
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Bill Overview
Analyzed Economic Effects
2 provisions identified: 0 benefits, 0 costs, 2 mixed.
End California-only car emission rules
This bill would end California’s special Clean Air Act waivers. All past waivers would be canceled, and any pending requests would be treated as denied, as of enactment. It would also repeal the laws that let California use its own motor-vehicle standards and let other states copy them, and remove related references across the Clean Air Act. If enacted, automakers and fuel makers could face one set of federal rules, which could lower some compliance costs. States would lose tougher state standards, which could reduce local air-quality protections.
Block state emission rules for equipment and trains
This bill would bar states and cities from setting or enforcing emission rules for nonroad engines. It would cover construction equipment, farm machinery, and new locomotives and locomotive engines. The ban would apply upon enactment. Makers and users of this equipment could face fewer state rules and lower costs. Local air-quality protections could be reduced.
Sponsors & CoSponsors
Sponsor
Nehls
TX • R
Cosponsors
Rep. Donalds, Byron [R-FL-19]
FL • R
Sponsored 3/18/2025
Sessions
TX • R
Sponsored 3/18/2025
Stauber
MN • R
Sponsored 3/18/2025
Rep. Ogles, Andrew [R-TN-5]
TN • R
Sponsored 3/18/2025
Rep. Van Orden, Derrick [R-WI-3]
WI • R
Sponsored 3/18/2025
Bost
IL • R
Sponsored 2/2/2026
Roll Call Votes
No roll call votes available for this bill.
View on Congress.gov