Transportation and Climate

Previously Proposed Emission Standards

This page includes a collection of previously proposed standards for greenhouse gas (GHG) emissions from mobile sources. For current regulations for controlling GHG emissions from new motor vehicles and their engines, see our Regulations and Standards page.

NOTE: You will need Adobe Acrobat Reader, available as a free download, to view some of the files on this page. See EPA's PDF page to learn more about PDF, and for a link to the free Acrobat Reader.

EPA/NHTSA Notice of Proposed Rulemaking to Establish 2017 and Later Model Year Light-Duty Vehicle Greenhouse Gas Emissions and CAFE Standards
On November 16, 2011, EPA and NHTSA issued their joint proposal to extend the National Program of harmonized greenhouse gas and fuel economy standards to model year 2017 through 2025 passenger vehicles.
- Fact Sheet: EPA and NHTSA Propose to Extend the National Program to Reduce Greenhouse Gases and Improve Fuel Economy for Cars and Trucks (PDF) (9 pp, 240K, EPA-420-F-11-038, November 2011)
- Proposed Rules (PDF) (567 pp, 13.4MB, published December 1, 2011)
- Draft Regulatory Impact Analysis (RIA) (PDF) (377 pp, 4.05MB, EPA-420-D-11-004, November 2011)
- Draft Joint Technical Support Document (TSD) (PDF) (479 pp, 12MB, EPA-420-D-11-901, November 2011)
- Background information is available below, such as the Notice of Intent, the Interim Joint Technical Assessment Report (PDF) (245 pp, 2,48MB), the Supplemental NOI and the 2nd Supplemental NOI.
Extension of the Comment Period: Comment Period Extension Notice (PDF) (2 pp. 149k, published January 13, 2012)

Information on Public Hearings: Announcement of Public Hearing (PDF) (2 pp, 144K, published December 9, 2011)
Public Hearing Transcripts
- Detroit, Michigan, January 17, 2012: Transcript of hearing (PDF) (348 pp, 678K, January 2012)
- Philadelphia, Pennsylvania, January 19, 2012: Transcript of hearing (PDF) (621 pp, 3.0M, January 2012)
- San Francisco, California, January 24, 2012: Transcript of hearing (PDF) (301 pp, 686K, January 2012)

Second Supplemental Notice of Intent to Establish 2017 and Later Model Year Light-Duty Vehicle Greenhouse Gas Emissions and CAFE Standards
On July 29, 2011, EPA and NHTSA issued a Supplemental Notice of Intent (NOI) announcing plans to propose stringent federal greenhouse gas and fuel economy standards for model year (MY) 2017-2025 light-duty vehicles as part of a coordinated National Program.
- Fact Sheet: EPA and NHTSA, in Coordination with California, Announce Plans to Propose Greenhouse Gas and Fuel Economy Standards for Passenger Cars and Light Trucks (PDF) (4 pp, 166K, EPA-420-F-11-027, July 2011)
- Second Supplemental Notice of Intent (PDF) (12 pp, 937K, published August 9, 2011)
- Read the Presidential Announcement and the commitment letters received in July 2011 from California and 13 automakers, expressing support for this effort.
Supplemental Notice of Upcoming Joint Rulemaking to Establish 2017 and Later Model Year Light-Duty Vehicle Greenhouse Gas Emissions and CAFE Standards
On November 30, 2010, EPA and NHTSA issued a Supplemental Notice of Intent (NOI) to begin developing new standards for greenhouse gas (GHG) and fuel economy for light-duty vehicles in model years (MY) 2017-2025.
- Fact Sheet: EPA and NHTSA Issue a Supplemental Notice in the Process for Setting Future Greenhouse Gas and Fuel Economy Standards for Passenger Cars and Light Trucks (PDF) (3 pp, 487K, EPA-420-F-10-059, November 2010)
- Notice (PDF) (9 pp, 178K, published December 8, 2010)
Notice of Intent to Establish 2017 and Later Model Year Light-Duty Vehicle Greenhouse Gas Emissions and CAFE Standards
On September 30, 2010, EPA and NHTSA issued a Notice of Intent to begin developing new standards for greenhouse gases and fuel economy for light-duty vehicles for the 2017-2025 model years. The agencies also issued, in coordination with California, an Interim Joint Technical Assessment Report. The beginning of this effort was announced by President Obama in May 2010, with broad support from stakeholders.
- Fact Sheet: EPA and NHTSA Announce a First Step in the Process for Setting Future Greenhouse Gas and Fuel Economy Standards (PDF) (4 pp, 651K, EPA-420-F-10-051, October 2010)
- Notice (PDF) (12 pp, 117K, published October 13, 2010)
- Interim Joint Technical Assessment Report: Light-Duty Vehicle Greenhouse Gas Emission Standards and Corporate Average Fuel Economy Standards for Model Years 2017-2025 (PDF) (245 pp, 2.46MB, September 2010)
- California Air Resources Board's Letter of Support (PDF) (3 pp, 48K, October 1, 2010)
- See the President’s Announcement and the commitment letters received in May 2010, expressing support for this effort.

Proposed Rulemaking: Greenhouse Gas Emissions Standards and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles (published November 30, 2010)
- Fact Sheet: EPA and NHTSA Propose First-Ever Program to Reduce Greenhouse Gas Emissions and Improve Fuel Efficiency of Medium- and Heavy-Duty Vehicles (PDF) (5 pp, 572K, EPA-420-F-10-901, October 2010)
- Correction Notice: Preamble and Regulations (PDF) (6 pp, 154K, published December 29, 2010)
- Preamble and Regulations (PDF) (305 pp, 9.84MB, published November 30, 2010)
- Draft Regulatory Impact Analysis (RIA) (PDF) (391 pp, 5.11MB, EPA-420-D-10-901, October 2010)
- Notice of Public Hearings (PDF) (2 pp, 53K, published November 1, 2010)
- See the GEM web page to read about the Greenhouse gas Emissions Model (GEM) for determining truck compliance
Proposed Rulemaking: Model Year 2012-2016 Light-Duty Vehicle Greenhouse Gas Emissions Standards and Corporate Average Fuel Economy Standards (published September 28, 2009)
- Fact Sheet: EPA and NHTSA Propose First-Ever National Program to Reduce Greenhouse Gas Emissions and Improve Fuel Economy For Cars and Trucks (PDF) (9 pp, 266K, EPA-420-F-09-047a, September 2009)
- Proposed Model Year 2012-2016 Rule (PDF, the entire document) (337 pp, 4.16MB, September 28, 2009)
- Draft Regulatory Impact Analysis (RIA) (PDF) (337 pp, 2.1M, EPA-420-D-09-003, September 2009)
- Draft Joint Technical Support Document (TSD) (PDF) (203 pp, 1.8M, EPA-420-D-09-901, September 2009)

EPA/NHTSA Notice of Intent to Establish Model Year 2012-2016 Joint Standards to Reduce Greenhouse Gas Emissions and Improve Fuel Economy for Cars and Trucks (published May 22, 2009)
In May 2009, EPA and the Department of Transportation issued a Notice of Intent stating that the two agencies would work together to establish national vehicle greenhouse gas and fuel economy standards for new cars and trucks sold in the United States. This joint Notice of Intent followed President Obama’s May 2009 announcement of a national policy that will reduce greenhouse gas emissions and improve fuel economy for all new cars and trucks sold in the United States.
- Fact Sheet: EPA Will Propose Historic Greenhouse Gas Emissions Standards for Light-Duty Vehicles (PDF) (4 pp, 531K, EPA-420-F-09-028, May 2009)
- Notice of Upcoming Joint Rulemaking to Establish Vehicle GHG Emissions and CAFÉ Standards (PDF) (6 pp, 112K, published May 22, 2009)
- The State of California and major automakers showed their support for this effort by sending letters to the agencies in 2009.

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Previously Proposed Emission Standards

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