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EPA/OAR RIN: 2060-AV50 Publication ID: Fall 2023 
Title: Greenhouse Gas Emissions Standards for Heavy-Duty Vehicles—Phase 3 

On April 12, 2023, EPA announced a proposal for more stringent standards to reduce greenhouse gas emissions from 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 proposed 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 also proposed an additional set of CO2 standards for HD vehicles that would begin to apply in MY 2028, with progressively more stringent 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. EPA has conducted outreach with a wide range of interested stakeholders to gather input which we have considered in developing this proposal, and we will continue to engage with the public and all interested stakeholders as part of our regulatory development process.

Agency: Environmental Protection Agency(EPA)  Priority: Section 3(f)(1) Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Final Rule Stage 
Major: Yes  Unfunded Mandates: No 
CFR Citation: 40 CFR 1037.1   
Legal Authority: 21 U.S.C. 346a    33 U.S.C. 1318    33 U.S.C. secs. 1311, 1314, 1316, 1317, 1318, 1361    15 U.S.C. 2003    33 U.S.C. 1326    42 U.S.C. 300f    42 U.S.C. 242b    33 U.S.C. 1342    33 U.S.C. 1345    42 U.S.C. 1857    42 U.S.C. 7542    42 U.S.C. 6901    42 U.S.C. 9601    49 U.S.C. 32901 to 32919q, Pub. L. 109-58    33 U.S.C. 1901    42 U.S.C. 11023    15 U.S.C. 2601   
Legal Deadline:  None

Statement of Need: This action is consistent with President Biden’s Executive Order, “Strengthening American Leadership in Clean Cars and Trucks.”

Summary of the Legal Basis: CAA section 202(a)

Alternatives: EPA requested comment to address alternative options in the proposed rule.

Anticipated Costs and Benefits: EPA analyzed costs and benefits in the proposed rule.

Risks: EPA evaluated the risks of this rulemaking in the proposed rule.

Action Date FR Cite
NPRM  04/27/2023  88 FR 25926   
NPRM Comment Period End  06/16/2023 
Final Rule  03/00/2024 
Additional Information: .
Regulatory Flexibility Analysis Required: Undetermined  Government Levels Affected: None 
Federalism: No 
Included in the Regulatory Plan: Yes 
Sectors Affected: 333618 Other Engine Equipment Manufacturing; 336111 Automobile Manufacturing; 336112 Light Truck and Utility Vehicle Manufacturing; 336120 Heavy Duty Truck Manufacturing; 336212 Truck Trailer Manufacturing; 811112 Automotive Exhaust System Repair; 811198 All Other Automotive Repair and Maintenance 
RIN Data Printed in the FR: No 
Agency Contact:
Alex Wang
Environmental Protection Agency
Office of Air and Radiation
2000 Traverwood Dr.,
Ann Arbor, MI 48105
Phone:248 462-3947

Tuana Phillips
Environmental Protection Agency
Office of Air and Radiation
1200 Pennsylvania NW,
Washington, DC 20460
Phone:202 565-0074