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EPA/OAR RIN: 2060-AW96 Publication ID: 2026 
Title: ●Revision of Tier 4 Phase-in Schedule for Light-Duty and Medium-Duty Vehicles 
Abstract:

Consistent with Administrator Zeldin's March 12, 2025, announcement, the EPA will initiate a rulemaking to reconsider the phase-in of the criteria pollutant standards established in the April 2024 multi-pollutant standards rule for Model Years 2027 and later for light-duty and medium-duty vehicles (89 FR 27842; April 18, 2024).

 
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: Yes  Unfunded Mandates: No 
EO 14192 Designation: Deregulatory 
CFR Citation: 40 CFR Part 86     (To search for a specific CFR, visit the Code of Federal Regulations.)
Legal Authority: 42 U.S.C. 7401-7671q.   
Legal Deadline:  None

Statement of Need:

This action is needed in light of the significant changes in future vehicle product plans which have occurred in the past year which impact automotive manufacturers compliance plans.

Summary of the Legal Basis:

Clean Air Act Section 202.

Alternatives:

The EPA is still evaluating potential alternatives that may be considered for the proposal.

Anticipated Costs and Benefits:

The EPA is still evaluating the associated costs and benefits associated with the forthcoming proposed rule.

Risks:

The EPA is still evaluating the scope and risks associated with the forthcoming proposed rule.
Timetable:
Action Date FR Cite
NPRM  07/00/2026 
Final Rule  To Be Determined 
Regulatory Flexibility Analysis Required: No  Government Levels Affected: Federal 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: Yes 
International Impacts: This regulatory action will be likely to have international trade and investment effects, or otherwise be of international interest.
RIN Data Printed in the FR: No 
Agency Contact:
John Kasab
Environmental Protection Agency
Office of Air and Radiation
2000 Traverwood Drive,
Ann Arbor, MI 48105
Phone:734 214-4559
Email: kasab.john@epa.gov