Proposed Rule: Reconsideration of 2009 Endangerment Finding and Greenhouse Gas Vehicle Standards
By Editors of CFACT
Written by Editors of CFACT
Estimated Reading Time: 3 minutes
Editors’ Note: While tariffs have gotten most of the headlines, the Trump Administration’s effort to deregulate the US economy has continued apace. This latest modification in EPA rules regarding so-called “greenhouse gases” could be among the most essential reforms ever enacted. Back in 2009, under the Obama Administration, the EPA was given vast powers because of the supposed connection between CO2 levels and so-called Global Warming.
Official draft EPA rule
Rule Summary
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)
- 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)
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 21, 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 August 19 and August 20, 2025. An additional session may be held on August 21, 2025, if necessary, to accommodate the number of testifiers that sign up to testify. Please check this page for updates about the dates and times of the hearings.
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