Proposed Rule: Reconsideration of 2009 Endangerment Finding and Greenhouse Gas Vehicle Standards
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Rule Summary
On July 29, 2025, EPA announced a proposal 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) (1.51 MB, July 2025, EPA-420-D-25-003)
- 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 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.
Public Hearing Testimony Transcripts
EPA held a virtual public hearing on August 19-22, 2025 for interested persons and entities to provide oral presentation of data, views, or arguments on the proposal. Transcripts of the virtual hearing testimony are available here:
- Virtual Hearing Transcript Day 1 (pdf)
- Virtual Hearing Transcript Day 2 (pdf)
- Virtual Hearing Transcript Day 3 (pdf)
- Virtual Hearing Transcript Day 4 (pdf)
Additional Resources
For more information:
- See previous standards that are proposed to be superseded by this action:
- See the final rule