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  2. Regulations for Emissions from Vehicles and Engines

Advance Notice of Proposed Rule: Control of Air Pollution from New Motor Vehicles: Heavy-Duty Engine Standards

On this page:

  • Rule Summary
  • Additional Resources

Rule Summary

Related Information
  • Regulations for Greenhouse Gas Emissions from Commercial Trucks & Buses
  • Regulations for Smog, Soot, and Other Air Pollution from Commercial Trucks & Buses

On January 6, 2020, the Administrator signed an Advance Notice of Proposed Rule soliciting pre-proposal comments on a rulemaking that would establish new emission standards for oxides of nitrogen and other pollutants from heavy-duty engines.

EPA sought input on this effort from the public, including all interested stakeholders.

The docket for this ANPR is available at regulations.gov Docket ID #EPA-HQ-OAR-2019-0055.

NOTE: The ANPRM and the documents linked below refer to Cleaner Trucks Initiative, which was a previous naming convention for the Control of Air Pollution from New Motor Vehicles: Heavy-Duty Engine and Vehicle Standard NPRM.

  • Advance Notice of Proposed Rule (pdf) (512 KB, published January 21, 2020)

Additional Resources

  • Fact Sheet: EPA Seeks Pre-Proposal Comments on the Cleaner Trucks Initiative (pdf) (68.9 KB, January 2020, EPA-420-F-20-003)
  • Denial of Requests for Extension of Comment Period: six organizations requested that EPA extend the public comment period for the ANPR. EPA sent letters explaining our denial of these requests to each of these organizations.
    • Request for Extension from the American Lung Association (pdf) (84.26 KB, February 13, 2020)
    • Letter from the EPA Office of Air and Radiation Principal Deputy Assistant Administrator Anne L. Idsal to the American Lung Association (pdf) (157.86 KB, February 18, 2020)
    • Request for Extension from the Environmental Defense Fund (pdf) (685.4 KB, January 31, 2020)
    • Letter from the EPA Office of Air and Radiation Principal Deputy Assistant Administrator Anne L. Idsal to the Environmental Defense Fund (pdf) (155.81 KB, February 18, 2020)
    • Request for Extension from the Northeast States for Coordinated Air Use Management (pdf) (209.35 KB, January 29, 2020)
    • Letter from the EPA Office of Air and Radiation Principal Deputy Assistant Administrator Anne L. Idsal to the Northeast States for Coordinated Air Use Management (pdf) (158.58 KB, February 18. 2020)
    • Request for Extension from the National Tribal Air Association (pdf) (394.77 KB, January 22, 2020)
    • Letter from the EPA Office of Air and Radiation Principal Deputy Assistant Administrator Anne L. Idsal to the National Tribal Air Association (pdf) (158.14 KB, February 18. 2020)
    • Request for Extension from the Manufacturers of Emission Controls Association and Advanced Engine Systems Institute (pdf) (249.68 KB, February 3, 2020)
    • Letter from the EPA Office of Air and Radiation Principal Deputy Assistant Administrator Anne L. Idsal to the Manufacturers of Emission Controls Association (pdf) (162.36 KB, February 18. 2020)
    • Letter from the EPA Office of Air and Radiation Principal Deputy Assistant Administrator Anne L. Idsal to the Advanced Engine Systems Institute (pdf) (159.23 KB, February 18, 2020)

Regulations for Emissions from Vehicles and Engines

  • Onroad
    • Passenger Vehicles
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Contact Us About Regulations for Emissions from Vehicles and Engines
Contact Us About Regulations for Emissions from Vehicles and Engines to ask a question, provide feedback, or report a problem.
Last updated on August 20, 2025
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