Proposed Rule: Greenhouse Gas Emissions Standards for Heavy-Duty Vehicles – Phase 3

On this page:

• Rule Summary
• Additional Resources

Rule Summary

On April 12, 2023, EPA announced a proposal for more stringent standards to reduce greenhouse gas emissions from heavy-duty (HD) vehicles beginning in model year (MY) 2027. The new standards would be applicable to HD vocational vehicles (such as delivery trucks, refuse haulers, public utility trucks, transit, shuttle, school buses, etc.) and tractors (such as day cabs and sleeper cabs on tractor-trailer trucks).

Specifically, EPA is proposing stronger CO₂ standards for MY 2027 HD vehicles that go beyond the current standards that apply under the HD Phase 2 Greenhouse Gas program. EPA is also is proposing an additional set of CO₂ standards for HD vehicles that would begin to apply in MY 2028, with progressively lower standards each model year through 2032. This proposed “Phase 3” greenhouse gas program maintains the flexible structure created in EPA’s Phase 2 greenhouse gas program, which is designed to reflect the diverse nature of the heavy-duty industry.

As part of this action, EPA also is proposing to revise its regulations addressing preemption of state regulation of locomotives.

• Proposed Rule: Greenhouse Gas Emissions Standards for Heavy-Duty Vehicles - Phase 3 (pdf) (4.0 MB, published April 27, 2023)

Comment Period and Public Hearing Information

EPA held a virtual hearing on May 2-3, 2023, for interested persons and entities to provide verbal comments on the proposal. Transcripts of the virtual hearing will be made available on this website soon.

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-2022-0985.

The comment period for this proposal closes on June 16, 2023. One organization and two public hearing testifiers requested that EPA extend the public comment period for the proposed rule. EPA sent letters explaining our denial of these requests to each of these organizations.

• Request for comment period extension by Amy Goldsmith, Clean Water Action (pdf) (77.46 KB, Public Hearing Day 2, May 3, 2023)
• Letter from EPA Office of Air and Radiation Principal Deputy Assistant Administrator Joseph Goffman to Amy Goldsmith, Clean Water Action (pdf) (80.05 KB, June 2, 2023)
• Request for comment period extension by Brandon Buchanan, American Bus Association (pdf) (78.91 KB, Public Hearing Day 1, May 2, 2023)
• Letter from EPA Office of Air and Radiation Principal Deputy Assistant Administrator Joseph Goffman to Brandon Buchanan, American Bus Association (pdf) (79.82 KB, June 2, 2023)
• Request for comment period extension from American Petroleum Institute and American Fuel & Petrochemical Manufacturers (pdf) (871.53 KB, May 5, 2023)
• Letter from EPA Office of Air and Radiation Principal Deputy Assistant Administrator Joseph Goffman to American Petroleum Institute (pdf) (83.09 KB, June 2, 2023)
• Letter from EPA Office of Air and Radiation Principal Deputy Assistant Administrator Joseph Goffman to American Fuel & Petrochemical Manufacturers (pdf) (101.71 KB, June 2, 2023)

Written comments on the proposal may be submitted to the docket for this rule through June 16, 2023. There are several ways to provide written comments on the proposal, identified by Docket ID No. EPA-HQ-OAR-2022-0985:

• 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. For more information See Find Dockets, Documents, and Comments FAQs.
• Email: a-and-r-Docket@epa.gov. Include Docket ID No. EPA-HQ-OAR-2022-0985 in the subject line of the message
• Mail: U.S. Environmental Protection Agency, EPA Docket Center, OAR, Docket EPA-HQ-OAR-2022-0985, 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 (CBI)/Proprietary Business Information (PBI), 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.

Para ver los documentos que respaldan esta reglamentación propuesta, así como los comentarios enviados, visite Regulations.gov y acceda a la regla con el número de identificación del expediente EPA-HQ-OAR-2022-0985.

Los comentarios por escrito sobre la propuesta se pueden enviar al expediente de esta regulación hasta el 16 de junio de 2023. Hay varias maneras de proporcionar comentarios por escrito sobre la propuesta, identificada con el número de expediente EPA-HQ-OAR-2022-0985:

• Portal federal de eRulemaking para esta propuesta: haga clic en la casilla "Comment" (Comentar) que está debajo del documento de la regulación propuesta, que es el primer documento que aparece en la pestaña "browse comments" (Buscar comentarios). Para obtener más información, vea "Find Dockets, Documents, and Comments FAQs" (Encontrar expedientes, documentos, comentarios y preguntas frecuentes) aquí.
• Correo electrónico: a-and-r-Docket@epa.gov. Incluya el número de identificación del expediente EPA-HQ-OAR-2022-0985 en el renglón del asunto del mensaje.
• Por correo: U.S. Environmental Protection Agency, EPA Docket Center, OAR, Docket EPA-HQ-OAR-2022-0985, Mail Code 28221T, 1200 Pennsylvania Avenue NW, Washington, DC 20460.
• Entrega en mano o servicio de correo (únicamente con cita previa): EPA Docket Center, EPA, WJC West Building, Room 3334, 1301 Constitution Avenue NW, Washington, DC 20004. El horario de atención del Centro de expedientes es de 8:30 a.m. a 4:30 p.m., de lunes a viernes (excepto en los feriados federales).

En los comentarios por escrito que se remitan al expediente, no incluya información que considere confidencial, como, por ejemplo, información comercial confidencial (CBI) o información sujeta a propiedad intelectual (PBI), información médica sobre otras personas o cualquier información cuya divulgación está restringida por una autoridad competente. Visite https://www.epa.gov/dockets/commenting-epa-dockets para obtener información sobre cómo enviar comentarios, incluida información sobre cómo enviar información confidencial como CBI/PBI, presentaciones multimedia e información general sobre cómo hacer comentarios eficaces.

Additional Resources

• Fact Sheet: Proposed Standards to Reduce Greenhouse Gas Emissions from Heavy-Duty Vehicles for Model Year 2027 and Beyond (pdf) (109 KB, April 2023, EPA-420-F-23-011)
• Normas propuestas para reducir las emisiones de gases de efecto invernadero de los vehículos pesados para modelos del año 2027 y posteriores (pdf) (113 KB, April 2023, EPA-420-F-23-012)
• Greenhouse Gas Emissions Standards for Heavy-Duty Vehicles: Phase 3: Draft Regulatory Impact Analysis (RIA) (pdf) (243 MB, April 2023, EPA-420-D-23-004)
• EPA’s Heavy Duty Technology Resources Use Case Scenario (HD TRUCS) Tool (xlsm) (April 2023)
• Redline Version of EPA’s Proposed Regulatory Amendments: Greenhouse Gas Emissions Standards for Heavy-Duty Vehicles – Phase 3 (pdf) (1.74 MB, April 2023)