Proposed Rule: Reconsideration of 2009 Endangerment Finding and Greenhouse Gas Vehicle Standards
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Rule Summary
EPA is extending the comment period for this proposed rule.
Public hearing dates have been announced.
Public hearing schedule of speakers.
On July 29, 2025, EPA proposed to rescind the 2009 Greenhouse Gas Endangerment Finding. The Endangerment Finding is a prerequisite for regulating emissions from new motor vehicles and new motor vehicle engines. Absent this finding, EPA lacks statutory authority under Section 202 of the Clean Air Act to prescribe standards for GHG emissions. Therefore, EPA also proposed to remove GHG regulations for light-, medium-, and heavy-duty on-highway vehicles.
As a result of these proposed changes, engine and vehicle manufacturers would no longer have any future obligations for the measurement, control, and reporting of GHG emissions for any highway engine and vehicle, including model years manufactured prior to this proposal. However, EPA intends to retain, without modification, regulations necessary for criteria pollutant and air toxic measurement and standards, Corporate Average Fuel Economy testing, and associated fuel economy labeling requirements.
Documents Related to this Proposal
- Reconsideration of 2009 Endangerment Finding and Greenhouse Gas Vehicle Standards: Notice of Proposed Rulemaking (pdf) (1.8 MB, published August 1, 2025)
- Reconsideration of 2009 Endangerment Finding and Greenhouse Gas Vehicle Standards: Draft Regulatory Impact Analysis (pdf)
- Redline Version of EPA’s Proposed Regulations for Reconsideration of 2009 Endangerment Finding and Greenhouse Gas Vehicle Standards (pdf)
- Public Hearing Notice (pdf) (196 KB, published August 1, 2025)
- Notice to extend the public comment period (pdf) (215 KB, published August 15, 2025)
Comment and Public Hearing Information
To view documents supporting this proposed rulemaking as well as comments submitted, please visit regulations.gov and access the rule under Docket ID No. EPA-HQ-OAR-2025-0194.
Written comments on the proposal may be submitted to the docket for this rule through September 22, 2025. There are several ways to provide written comments on the proposal, identified by Docket ID No. EPA-HQ-OAR-2025-0194:
- Federal eRulemaking Portal for this proposal: click on the “Comment” box under the proposed rule document, which is the first document listed under the “browse comments” tab.
- Email: a-and-r-Docket@epa.gov. Include Docket ID No. EPA-HQ-OAR-2025-0194 in the subject line of the message.
- Mail: U.S. Environmental Protection Agency, EPA Docket Center, OAR, Docket EPA-HQ-OAR-2025-0194, Mail Code 28221T, 1200 Pennsylvania Avenue NW, Washington, DC 20460.
- Hand Delivery or Courier (by scheduled appointment only): EPA Docket Center, WJC West Building, Room 3334, 1301 Constitution Avenue NW, Washington, DC 20004. The Docket Center’s hours of operations are 8:30 a.m.–4:30 p.m., Monday–Friday (except federal holidays).
In written comments submitted to the docket, do not include any information you consider to be sensitive information, including but not limited to Confidential Business Information/Proprietary Business Information, medical information about someone other than yourself, or any information whose disclosure is restricted by an applicable authority. Please visit Commenting on EPA Dockets for more information on submitting comments, including information about how to submit sensitive information such as CBI/PBI or multimedia submissions, and general guidance on making effective comments.
EPA plans to hold a virtual public hearing for this proposed rule, Reconsideration of 2009 Endangerment Finding and Greenhouse Gas Vehicle Standards. The hearing is scheduled to occur on Tuesday, August 19 and conclude on Friday, August 22.
- On August 19, the hearing will begin at 8:00am EDT and end no later than 8:00pm EDT.
- On August 20, the hearing will begin at 10:00am EDT and end no later than 10:00pm EDT. | Public Hearing Schedule of Speakers (August 20, 2025) (pdf)
- On August 21, the hearing will begin at 8:00am EDT and end no later than 8:00pm EDT. | Public Hearing Schedule of Speakers (August 21, 2025) (pdf)
- On August 22, the hearing will begin at 10:00am EDT and end no later than 4:00pm EDT.
Please check this page for updates about the dates and times of the hearings.
Registration
Public hearing registration will be open through the last day of the hearing, however, we ask that you pre-register by August 12, 2025 if you intend to testify or are requesting special accommodations. To the extent possible, EPA will work to accommodate late requests. All attendees (including those who will not be presenting verbal testimony) must register. Please submit a separate registration form for each person attending the hearing. More information on how to join the hearing will be sent to the email address that you provide for registration.
To register, please send an email to EPA-MobileSource-Hearings@epa.gov.
Additional Resources
For more information on previous standards that are proposed to be superseded by this action, visit: