Automakers back EPA delay of vehicle pollution rules, seek rewrite

Major automakers are backing a two-year delay in federal vehicle pollution rules, even as they press the Environmental Protection Agency to move fast on a rewrite so manufacturers and suppliers know what comes next. The proposal would push the Tier 4 standards for light- and medium-duty vehicles from model year 2027 to model year 2029, a shift that could reshape vehicle pricing, powertrain investment and the pace of emissions cuts across the U.S. auto market.

The industry’s support comes through the Alliance for Automotive Innovation, which said the EPA move was “a smart and necessary step.” John Bozzella, the group’s chief executive, said the earlier standards were not achievable without major growth in EV sales and argued they would have made gas-powered vehicles more expensive. The alliance counts GM, Ford, Stellantis, Toyota, Volkswagen and Hyundai among its members, giving its position unusual weight in Washington.

The EPA published the proposal in the Federal Register on May 18 under docket EPA-HQ-OAR-2025-3297 after announcing it on May 14. The agency scheduled public hearings for June 3 and 4 and set a July 6 deadline for written comments. In its rule summary, EPA said Part 1 of the two-part reconsideration is meant to give manufacturers and suppliers additional lead time amid changing market conditions and feasibility concerns.

The agency said the delay would save more than $1.7 billion, part of a broader argument that the move would ease compliance costs for automakers and, by extension, consumers. EPA also said the reconsideration may extend beyond the phase-in schedule to include standards, implementation dates, test procedures and other program elements, with a separate Part 2 rulemaking to follow later.

The stakes are bigger than one compliance timetable. The Biden-era rule, finalized on March 20, 2024, was designed to force steep cuts in pollution from passenger cars, light trucks and medium-duty vehicles. EPA says the Tier 4 standards regulate smog-forming pollution, fine particle pollution, carbon monoxide, formaldehyde and vehicle fuel-vapor emissions. Under the proposal, Tier 3 would continue through model years 2027 and 2028 before Tier 4 takes effect in 2029.

Environmental groups say slowing the rules would have public-health costs. Earthjustice said the delay would mean dirtier air and greater health consequences. The American Lung Association warned it would hurt children, older adults and people with lung disease. The Environmental Defense Fund said the rollback would cost hundreds of lives and billions of dollars in health harms.

The clash captures a familiar Washington fight with high economic and climate stakes. Automakers want clearer rules to plan factories, supplier contracts and vehicle lineups. Environmental advocates say every year of delay slows the transition to cleaner vehicles and weakens progress toward the country’s pollution goals.