EPA scraps Endangerment Finding, GHG emission standards: What you need to know
“Road Closed Ahead.” That’s the sign that now stands at the entrance of the regulatory road leading to the federal greenhouse gas (GHG) emission standards for vehicle and engine manufacturers.
The Environmental Protection Agency (EPA) finalized a rule on February 18, 2026, to rescind the 2009 Endangerment Finding and repeal all GHG emission standards for new motor vehicles and motor vehicle engines. The final rule applies to vehicles and engines of model years 2012 to 2027 and beyond.
This overview will help you navigate EPA’s final rule that puts GHG emission requirements for vehicles in the rearview mirror.
What does this mean?
Manufacturers (including importers) of new motor vehicles and motor vehicle engines will no longer have future obligations to measure, control, report, or comply with federal GHG emission standards.
Specifically, the final rule removes the requirements for controlling GHG emissions, which include:
- Emission standards;
- Test procedures;
- Averaging, banking, and trading requirements;
- Reporting requirements; and
- Fleet-average emission requirements.
Additionally, the final rule eliminates off-cycle credits for manufacturers that added certain technologies to their vehicles and engines (like waste heat recovery) and EPA’s incentives for manufacturers to install a start-stop system (which automatically shuts off a vehicle’s engine when idling).
When do the changes apply?
The final rule takes effect on April 20, 2026. However, a legal challenge has already been brought against the rulemaking, and more litigation is likely.
It’s important to keep an eye on the status of the rule. Legal challenges could result in changes to the rule, such as delaying its effective date.
What regulations were removed?
The final rule repeals all GHG emission regulations in 40 CFR:
Why did EPA remove the standards?
The road to reversal begins in 2009. That’s when EPA issued two findings: the Endangerment Finding and the Cause or Contribute Finding. Collectively, these findings are referred to as the 2009 Endangerment Finding. The agency used the 2009 Endangerment Finding as the legal basis under Section 202(a) of the Clean Air Act (CAA) to regulate GHG emissions from new motor vehicles and motor vehicle engines based on global climate change concerns.
However, upon reconsideration, EPA no longer believes that it has the statutory authority under Section 202(a) of the CAA to regulate GHG emissions from new motor vehicles and motor vehicle engines in response to global climate change concerns. The agency bases its determination on three factors:
- EPA concludes that the best reading of Section 202(a) of the CAA authorizes the agency to regulate air pollution that threatens to endanger health and welfare through local and regional exposure. Therefore, the CAA doesn’t give EPA the authority to regulate GHG emissions based on global climate change concerns. The agency conducted the “best reading” by using standard interpretation principles and being informed by the Supreme Court’s overturning of “Chevron deference” in Loper Bright Enterprises v. Raimondo (2024).
- EPA lacks the congressional authorization required to regulate GHG emissions based on global climate change concerns. The agency determined that the major questions doctrine (i.e., federal agencies may not decide issues of major national significance without clear authorization granted by Congress) applies to the Endangerment Finding and that Congress doesn’t give EPA the authority under Section 202(a) of the CAA to decide a national policy response to global climate change concerns.
- The GHG emission regulations don’t and can’t have a meaningful impact on the identified health and welfare dangers that the Endangerment Finding attributed to global climate change. EPA based this conclusion on the results of climate impact modeling that the public submitted in response to the proposed rule and on the agency’s modeling analysis used to evaluate the submissions.
By rescinding the Endangerment Finding, EPA has no legal basis to regulate GHG emissions from new motor vehicles and motor vehicle engines. Accordingly, the final rule also repeals all GHG emission standards for light-, medium-, and heavy-duty vehicles and heavy-duty engines.
Key to remember: EPA’s final rule eliminates the 2009 Endangerment Finding and the related GHG emission requirements for on-highway vehicles and vehicle engines.





















































