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Repeals the federal Clean Air Act waiver that let California (and, by extension, other states adopting its rules) set its own vehicle emissions standards and bars states and local governments from adopting or enforcing standards for motor vehicle emissions and emissions from nonroad engines and vehicles (including new construction and farm equipment, new locomotives, and locomotive engines). It also declares previously issued waivers void and denies any pending waiver applications, and makes conforming changes across the Clean Air Act. The changes take effect immediately as specified in the text. The law removes a long-standing state-level pathway for stricter emissions rules, shifting regulatory authority to the federal baseline and affecting state air agencies, equipment manufacturers, vehicle makers, farmers, construction sectors, and communities concerned with air quality and climate policy.
The bill trades national regulatory uniformity and lower compliance costs for manufacturers and simpler state rulemaking against reduced state authority to adopt stricter emissions standards—likely slowing cleaner-vehicle and nonroad-equipment adoption and worsening local air quality and health outcomes while increasing legal and transition costs.
Manufacturers and sellers of cars, trucks, and nonroad equipment face a single national regulatory regime, reducing compliance complexity and likely lowering production and compliance costs that can be passed to buyers.
States (other than California) gain clearer, more uniform regulatory choices because they are no longer able or required to adopt California's separate standards, simplifying state-level rulemaking.
People in states that would have adopted California or stricter nonroad standards (including urban communities) are likely to face higher pollution-related health risks and related costs because stronger local limits are barred.
Federal preemption of state and California emission and fuel rules reduces incentives for cleaner technologies and is likely to slow long-term emissions reductions and air-quality improvements.
Voiding existing waivers and denying pending applications creates regulatory uncertainty and is likely to trigger litigation, transition costs, and increased regulatory complexity for states, manufacturers, and federal agencies.
Introduced March 14, 2025 by Mike Lee · Last progress March 14, 2025