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EPA/OAR RIN: 2060-AX01 Publication ID: 2026 
Title: ●Revision of Criteria Pollutant and Air Toxics Standards for Light-duty and Medium-duty Vehicles for Model Years 2029 and Later 
Abstract:

Consistent with Administrator Zeldin’s March 12, 2025, announcement, EPA will initiate a rulemaking to reconsider the Tier 4 light- and medium-duty criteria pollutant and air toxics standards established in the April 2024 multi-pollutant standards rule, applicable to Model Years 2029 and later.

 
Agency: Environmental Protection Agency(EPA)  Priority: Economically Significant 
RIN Status: First time published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: Undetermined  Unfunded Mandates: No 
EO 14192 Designation: Deregulatory 
CFR Citation: 40 CFR Part 85    40 CFR 86    40 CFR 600    40 CFR 1066     (To search for a specific CFR, visit the Code of Federal Regulations.)
Legal Authority: 42 U.S.C. 7521   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  11/00/2026 
Regulatory Flexibility Analysis Required: No  Government Levels Affected: Federal 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
International Impacts: This regulatory action will be likely to have international trade and investment effects, or otherwise be of international interest.
Sectors Affected: 333618 Other Engine Equipment Manufacturing; 335312 Motor and Generator Manufacturing; 33611 Automobile and Light Duty Motor Vehicle Manufacturing; 336211 Motor Vehicle Body Manufacturing; 336312 Gasoline Engine and Engine Parts Manufacturing; 423110 Automobile and Other Motor Vehicle Merchant Wholesalers; 811111 General Automotive Repair; 811112 Automotive Exhaust System Repair; 811198 All Other Automotive Repair and Maintenance 
RIN Data Printed in the FR: No 
Agency Contact:
Elizabeth Miller
Environmental Protection Agency
Office of Air and Radiation
2565 Plymouth Road,
Ann Arbor, MI 48105
Phone:734 214-4703
Email: miller.elizabeth@epa.gov