Alliance for Automotive Innovation
Trade associationSupport
Vehicle emission standards delay
Tier 4 Criteria Pollutant Standards, Part 1: Phase-In Schedule for Light-Duty and Medium-Duty Vehicles
EPA-HQ-OAR-2025-3297-0001NPRM
Comments
353
Last activity Jul 14, 2026
Deadline
Closed on Jul 7, 2026
Closed Jul 7, 2026
Net supportiSupport minus oppose · campaigns included
-30%
-30% excluding campaigns
Document
Details
The document's own metadata, straight from the source system.
- Title
- Tier 4 Criteria Pollutant Standards, Part 1: Phase-In Schedule for Light-Duty and Medium-Duty Vehicles
Federal Register for Monday, May 18, 2026 (91 FR 28463) (FRL-13030-01-OAR)
- Posted
- May 18, 2026
- Comment period
- May 18, 2026 – Jul 7, 2026
- FR Doc
- 2026-09905
- CFR
- 40 CFR Parts 85, 86, and 1066
Analysis
Overview
What the public is saying — stance, who's commenting, and the issues they raise.
Include campaigns
Analyzed 352 of 353 comments
100%· analysis in progress
Stance breakdown
-30%
Net support
Support118Oppose223Other11Not yet analyzed1
Aggregates include form-letter campaigns. Excluding them, net support is -30% across organic comments.
Who commented
Breakdown by commenter type.
Individual
223
Government
15
Trade association
9
Advocacy
48
Academic
4
Business
49
Other
4
Not yet analyzed
1
Comments over time
Weekly arrivals, stacked by stance.
Posted May 18, 2026Deadline Jul 7, 2026
May 18Jun 1Jun 15Jun 29Jul 13
Support118Oppose223Other11
Support × commenter type
How each type splits across stance.
Support
Oppose
Other
Individual
22%
77%
1%
Business
96%
4%
0%
Advocacy
25%
73%
2%
Government
13%
80%
7%
Trade association
100%
0%
0%
Academic
0%
50%
50%
Other
0%
0%
100%
Issues raised
The docket's canonical issues. Select one to browse its comments.
Oppose delay of tier 4 standards192
Vehicle emissions standards183
Economic impact of emissions standards125
Public health and environmental justice117
Vehicle emission standards delay90
Vehicle maintenance and operating costs41
Rollback of emissions mandates39
Public health impacts of emissions23
Tier 4 standard feasibility23
Regulatory stability and investment protection12
Position map
Who stands where on each issue?
Every non-silent position is backed by an excerpt from the comment.
Issues shown
Uncheck an issue to choose another.
| Organization | Vehicle maintenance and operating costs | Oppose delay of tier 4 standards | Vehicle emission standards delay | Economic impact of emissions standards | Public health impacts of emissions |
|---|---|---|---|---|---|
Alliance for Automotive Innovation Trade associationSupport The Alliance for Automotive Innovation supports the EPA's proposal to extend the Tier 3 emissions program and delay the | · | · | · | · | |
American Lung Association AdvocacyOppose Matthew Nigro, representing the American Lung Association, opposes the EPA's proposed delays and weakenings of the Tier | · | · | |||
FASS / Diesel Performance Products Inc. BusinessSupport Jeremy L. | · | · | · | · | |
Hicksville Auto Recyclers BusinessSupport Daniel Glore of Hicksville Auto Recyclers supports the EPA's proposal to roll back emission standards for light-duty and | · | · | · | · | |
International Council on Clean Transportation (ICCT) AdvocacyOppose The International Council on Clean Transportation (ICCT) opposes the EPA's proposed delay of the Tier 4 Criteria Polluta | · | · | · | ||
Natural Resources Defense Council AdvocacyOppose The Natural Resources Defense Council, along with several other environmental organizations, opposes the EPA's proposed | · | · | · | ||
NMI Diesel BusinessSupport NMI Diesel supports the EPA's proposal to roll back emissions standards, arguing that current regulations make diesel ve | · | · | · | · | |
Power Hungry Performance, Inc. BusinessSupport Angela Cohron, CEO of Power Hungry Performance, Inc., supports the EPA's proposal to roll back emissions standards for l | · | · | · | · |
American Lung Association
AdvocacyOppose
Oppose delay of tier 4 standards
Vehicle emission standards delay
Public health impacts of emissions
FASS / Diesel Performance Products Inc.
BusinessSupport
Vehicle maintenance and operating costs
Hicksville Auto Recyclers
BusinessSupport
Vehicle maintenance and operating costs
International Council on Clean Transportation (ICCT)
AdvocacyOppose
Oppose delay of tier 4 standards
Economic impact of emissions standards
Natural Resources Defense Council
AdvocacyOppose
Oppose delay of tier 4 standards
Vehicle emission standards delay
NMI Diesel
BusinessSupport
Vehicle maintenance and operating costs
Power Hungry Performance, Inc.
BusinessSupport
Vehicle maintenance and operating costs
39 organization-typed comments could not be identified.
Comments
Explorer
Every mirrored comment — filter by stance, campaign, or issue.
Filter:
- Jul 14, 2026Anonymous public commentOpposeAdvocacy📎 Attachment
A climate advocate is opposing the proposed postponement of Tier 4 emission standards for light and medium-duty vehicles. The commenter argues that delaying these standards will harm public health and increase air pollution in communities.
Read comment → - Jul 8, 2026Comment submitted by Mikayla WilliamsOpposeIndividual📎 Attachment
Mikayla Williams is writing to express concern over the proposal to postpone the implementation of Tier 4 criteria pollutant standards for vehicles. She argues that delaying these standards will allow preventable pollution to continue and urges the EPA to prioritize public health by withdrawing the delay.
Read comment → - Jul 7, 2026Mass comment campaign sponsored by American Lung AssociationOpposeAdvocacy📎 Attachment
Matthew Nigro, representing the American Lung Association, opposes the EPA's proposed delays and weakenings of the Tier 4 light- and medium-duty vehicle standards. He argues that traffic pollution poses significant health risks, particularly to children, and that delaying the adoption of effective emission-reduction technology will harm public health.
Read comment → - Jul 6, 2026Comment submitted by William FunariOpposeIndividual📎 Attachment
William Funari, a private citizen diagnosed with COPD, opposes the EPA's proposal to delay the implementation of Tier 4 air pollution standards for light- and medium-duty vehicles. He argues that these standards are essential for protecting public health, particularly for children and marginalized communities, and that delaying them would lead to increased health costs and preventable deaths.
Read comment → - Jul 6, 2026Comment submitted by Alliance for Automotive InnovationSupportTrade association📎 Attachment
The Alliance for Automotive Innovation supports the EPA's proposal to extend the Tier 3 emissions program and delay the implementation of Tier 4 standards. They argue that the current EV market growth is slower than anticipated and that manufacturers need more lead time to develop the necessary technologies to meet the more stringent Tier 4 requirements.
Read comment → - Jul 6, 2026Comment submitted by Natural Resources Defense Council (NRDC) et al.OpposeAdvocacy📎 Attachment
The Natural Resources Defense Council, along with several other environmental organizations, opposes the EPA's proposed revision of Tier 4 criteria pollutant standards for light- and medium-duty vehicles. They argue the proposal is an unlawful "rollback" that retroactively weakens standards, violates the Clean Air Act's anti-backsliding mandate, and fails to adequately protect public health from dangerous emissions.
Read comment → - Jul 6, 2026Comment submitted by Alliance for Automotive InnovationSupportTrade association📎 Attachment
The Alliance for Automotive Innovation supports the EPA's proposal to extend the Tier 3 emissions program and delay the implementation of Tier 4 standards. They argue that the current EV market growth is slower than anticipated and that manufacturers need more lead time to develop the necessary technologies to meet the more stringent Tier 4 requirements.
Read comment → - Jul 6, 2026Comment submitted by Bryan RomkeySupportIndividualRead comment →
- Jul 6, 2026Comment submitted by Peter McloughlinSupportIndividualRead comment →
- Jul 6, 2026Comment submitted by MEMA, The Vehicle Suppliers AssociationSupportTrade association📎 Attachment
MEMA, a trade association representing vehicle suppliers, supports the EPA's proposal to delay certain Tier 4 NMOG+NOx requirements by one to two years to provide compliance flexibility for customers. However, they emphasize that such delays impact supplier investments and strongly advocate for maintaining the existing Tier 4 particulate matter standards.
Read comment →