EPARulemakingEPA-HQ-OAR-2025-3297

Revision of Tier 4 Phase-in Schedule for Light-Duty and Medium-Duty Vehicles

RIN

2060-AW96

Last modified

Jul 1, 2026

Comment window

closed 22d ago

Environmental Defense Fund filings

Activity

Environmental Defense Fund filed 1 comment on this docket between May 29, 2026 and May 29, 2026. 34 other organizations filed here. The comment window closed 22d ago.

What Environmental Defense Fund filed (1)

May 29, 2026· Comment submitted by Environmental Defense Fund (EDF) et al.· EPA-HQ-OAR-2025-3297-0059

To Whom It May Concern: Please see the attached request for extension of the public comment period for Docket ID No. EPA–HQ–OAR–2025–3297; "Revision of Tier 4 Criteria Pollutant Standards, Part 1: Amendments to Phase-In Schedule for Light-Duty and Medium-Duty Vehicles," 95 Fed. Reg. 28463 (May 18, 2026). See also attached Exhibit 1: Freedom of Information Act Request for Records of Light- and Medium-Duty Emissions Compliance Documentation, Case Number 2026-EPA-05129 (Submitted by Environmental Defense Fund on 05/21/2026). Sincerely, Andy Su Senior Attorney Environmental Defense Fund

Download attachment ↓View on regulations.gov →

Abstract

The U.S. Environmental Protection Agency (EPA) is proposing to extend the Tier 3 criteria pollutant standards for vehicles up to 6,000 pounds gross vehicle weight rating into model years (MYs) 2027 and 2028, and to delay the start of the phase-in of the Tier 4 criteria pollutant standards until MY 2029.

View on regulations.gov →

Co-filers (34)

See everyone who commented →

Environmental Defense FundTHIS ORG
1 filing · confidence 97%
Natural Resources Defense Council (NRDC)trade assoc.
7 filings · confidence 97%
International Council on Clean Transportationtrade assoc.
4 filings · confidence 85%
Alliance for Automotive Innovationtrade assoc.
3 filings · confidence 97%
Manufacturers of Emission Controls Associationtrade assoc.
3 filings · confidence 85%
Big Creek Motorsports LLCunverified attribution
2 filings · confidence 70%
Environmental Protection Network (EPN)trade assoc.
2 filings · confidence 97%
Mass comment campaign sponsored by National Religious Partnership for the Environmenttrade assoc.
2 filings · confidence 85%
Alliance for Clean Vehicle Technologytrade assoc.
1 filing · confidence 85%
Alliance of Nurses for Healthy Environmentstrade assoc.
1 filing · confidence 85%
American Consumer Institutetrade assoc.
1 filing · confidence 85%
American Enterprise Institutetrade assoc.
1 filing · confidence 85%
American Petroleum Institutetrade assoc.
1 filing · confidence 97%
CZV Inc.unverified attribution
1 filing · confidence 70%
Damstrong LLCunverified attribution
1 filing · confidence 70%
FCA US LLC (a subsidiary of Stellantis N.V.)unverified attribution
1 filing · confidence 70%
Ford Motor Companyunverified attribution
1 filing · confidence 70%
General Motors LLCunverified attribution
1 filing · confidence 70%
Ingevity Corporationunverified attribution
1 filing · confidence 70%
Institute for Policy Integrity at New York University School of Lawtrade assoc.
1 filing · confidence 85%
Kia Corporationunverified attribution
1 filing · confidence 70%
Mass comment campaign sponsored by American Lung Associationtrade assoc.
1 filing · confidence 85%
National Association of Clean Air Agenciestrade assoc.
1 filing · confidence 85%
National Association of Manufacturers (NAM)trade assoc.
1 filing · confidence 97%
National Automobile Dealers Associationtrade assoc.
1 filing · confidence 97%
National Parks Conservation Associationtrade assoc.
1 filing · confidence 85%
Performance Parts Group LLCunverified attribution
1 filing · confidence 70%
Prime Mover Institutetrade assoc.
1 filing · confidence 85%
Southern Environmental Law Center (SELC)
1 filing · confidence 97%
The Vehicle Suppliers Associationtrade assoc.
1 filing · confidence 85%
Truck and Engine Manufacturers Associationtrade assoc.
1 filing · confidence 85%
U-Haul Holding Companyunverified attribution
1 filing · confidence 70%
U.S. Chamber of Commerce
1 filing · confidence 97%
Union of Concerned Scientistsunverified attribution
1 filing · confidence 70%
Zero Emission Transportation Associationtrade assoc.
1 filing · confidence 85%