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Regulations for Emissions from Vehicles and Engines

Regulations for Greenhouse Gas Emissions from Passenger Cars and Trucks

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The national program for greenhouse gas emissions (GHG) and fuel economy standards for light-duty vehicles (passenger cars and trucks) was developed jointly by EPA and the National Highway Traffic Safety Administration (NHTSA).

The standards were established in two phases:
  • Phase 1 - Model years 2012 - 2016; and
  • Phase 2 - Model years 2017 - 2025.

As part of the 2017-2025 standards rulemaking, EPA made a regulatory commitment to conduct a Midterm Evaluation of the longer-term standards for model years 2022-2025, in coordination with NHTSA and the California Air Resources Board.

In April 2020, NHTSA and EPA amended the Corporate Average Fuel Economy (CAFE) and greenhouse gas emissions standards for passenger cars and light trucks and established new less stringent standards, covering model years 2021 through 2026.

Learn more:

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Annual Reports

EPA issues annual reports on vehicle manufacturers' performance in meeting the GHG emissions standards, and on light duty fuel economy and GHG emission trends since 1975.

Click the links below to read the reports:

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List of Related Regulations

Below is a list of all regulations related to GHG emissions from light-duty passenger cars and trucks.


For help on using the table:
Click the regulation titles for additional information, including:
  • Regulations;
  • Regulatory impact analyses;
  • Comment summaries;
  • Rule histories; and
  • Fact sheets.
Regulation Title Regulation Date
E85 Flexible Fuel Vehicle Weighting Factor (F-factor) for Model Years 2021 and Later Vehicles 2020/08
Technical Correction to the Flex-fuel Vehicle Provisions in CAFE Regulations Direct Final Rule with Companion Notice of Proposed Rulemaking 2020/07
Small Volume Manufacturers Alternative GHG Standards Final Determinations  2020/06
Final Rule: One National Program on Federal Preemption of State Fuel Economy Standards 2019/09
Small Volume Manufacturer Alternative GHG Standards Draft Determinations 2019/07
The Safer Affordable Fuel Efficient (SAFE) Vehicles Proposed Rule for Model Years 2021-2026 2018/09
Proposed Rule for Technical Amendments to the Light-duty Vehicle Greenhouse Gas Program 2018/09
Final Rule for Model Year 2017 and Later Light-Duty Vehicle Greenhouse Gas Emissions and Corporate Average Fuel Economy Standards 2012/10
Final Rule for Model Year 2012 - 2016 Light-Duty Vehicle Greenhouse Gas Emission Standards and Corporate Average Fuel Economy Standards 2010/05
Endangerment and Cause or Contribute Findings for Greenhouse Gases under the Section 202(a) of the Clean Air Act 2009/12
California GHG Waiver Request 2009/06

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