Rulemaking

Amendments and Nonconformance Penalties for Model Year 2027 and Later Heavy-Duty Highway Engines and Amendments to Inducement Provisions for SCR-Equipped Diesel Engines.

🏛 Environmental Protection Agency (EPA)EPA-HQ-OAR-2026-0728

Chemical & Toxic Substances Climate & Emissions Government Governance & Reform Maritime & Shipping Oil, Gas & Fossil Fuels Public Lands & Conservation Small Business Surface Transportation Vehicles & Auto Safety

Documents

115

Total comments

28 awaiting analysis

Comment status

Open

Last activity

Jul 31, 2026

In this docket

Documents

Rules, notices, and supporting material — the primary rule pinned first.

All 115 Supporting & Related Material 112 Other 1 Proposed Rule 1

📄 Primary document

Proposed RuleJul 14, 2026

Amendments and Nonconformance Penalties for Model Year 2027 and Later Heavy-Duty Highway Engines and Amendments to Inducement Provisions for SCR-Equipped Diesel Engines

Open · 26 days left💬 18 comments · 18 awaiting analysis

Open →

Other· Jul 9, 2026
Memo Opening Docket for Public Access→
No comment period
Supporting & Related Material· Jul 9, 2026
Air Quality Modeling for the HD 2027 Proposal: Draft Technical Support Document→
Supporting & Related Material· Jul 9, 2026
Memo Incorporating Dockets Heavy-Duty Rule→
Supporting & Related Material· Jul 9, 2026
Final Technical Support Document Nonconformance Penalties for 2004 Highway Heavy-Duty Diesel Engines August 2002 EPA-420-R-02-021→
Supporting & Related Material· Jul 9, 2026
Uncertainty Dominates Pre-Buy Discussions Ahead of 2027 - TT→
Supporting & Related Material· Jul 9, 2026
Technical Support Document Nonconformance Penalties for On-highway Heavy-duty Diesel Engines August 2012 EPA-420-R-12-014→
Supporting & Related Material· Jul 9, 2026
Goodbye, 2027 Truck Prebuy Heavy Duty Trucking→
Supporting & Related Material· Jul 9, 2026
Analysis of Heavy-Duty Vehicle Sales Impacts Due to New Regulation→
Supporting & Related Material· Jul 9, 2026
Redline Version of EPA’s Proposed Regulation for Amendments and Nonconformance Penalties for Model Year 2027 and Later Heavy-Duty Highway Engines and Amendments to Inducement Provisions for SCR-Equipped Diesel Engines→
Supporting & Related Material· Jul 9, 2026
Regulatory Impact Analysis: Control of Air Pollution from New Motor Vehicles: Heavy-Duty Engine and Vehicle Standards→
Supporting & Related Material· Jul 9, 2026
Response to Comments: Control of Air Pollution from New Motor Vehicles Heavy Duty Engine and Vehicle Standards→
Supporting & Related Material· Jul 9, 2026
2020 AirToxScreen: Assessment Results US EPA→
Supporting & Related Material· Jul 9, 2026
EPA Green Book Data Download Data Dictionary→
Supporting & Related Material· Jul 9, 2026
Regional Haze→
Supporting & Related Material· Jul 9, 2026
Ozone National Ambient Air Quality Standards (NAAQS) USEPA→
Supporting & Related Material· Jul 9, 2026
Primary National Ambient Air Quality Standards (NAAQS) for Nitrogen Dioxide USEPA→
Supporting & Related Material· Jul 9, 2026
Green Book Data Download USEPA→
Supporting & Related Material· Jul 9, 2026
Carbon Monoxide (CO) Air Quality Standards USEPA→
Supporting & Related Material· Jul 9, 2026
National Ambient Air Quality Standards (NAAQS) for PM USEPA→
Supporting & Related Material· Jul 9, 2026
acid-deposition tech doc→
Supporting & Related Material· Jul 9, 2026
pm-naaqs powering the great american comeback fact sheet→
Supporting & Related Material· Jul 9, 2026
regional haze tech doc→
Supporting & Related Material· Jul 9, 2026
Acid Deposition→
Supporting & Related Material· Jul 9, 2026
2020 airtoxscreen risk drivers→
Supporting & Related Material· Jul 9, 2026
Regional Haze Program US EPA→
Supporting & Related Material· Jul 9, 2026
Integrated Science Assessment PM Final 2019→
Supporting & Related Material· Jul 9, 2026
Regulatory Impact Analysis Control of Hazardous Air Pollutants from Mobile Sources→
Supporting & Related Material· Jul 9, 2026
Contribution of mobile sources to secondary formation of carbonyl compounds→
Supporting & Related Material· Jul 9, 2026
Map 8-Hour Ozone Nonattainment Areas (2008 Standard)→
Supporting & Related Material· Jul 9, 2026
Map Counties Designated Nonattainment for PM-2.5 (1997, 2006, and/or 2012 Standards)→
Supporting & Related Material· Jul 9, 2026
Map 8-Hour Ozone Nonattainment Areas (2015 Standard)→
Supporting & Related Material· Jul 9, 2026
allpolls naa 260228 Spreadsheet→
Supporting & Related Material· Jul 9, 2026
2017 Report to Congress on the Benefits and Costs of Federal Regulations and Agency Compliance with the Unfunded Mandates Reform Act→
Supporting & Related Material· Jul 9, 2026
OMB 2005 Sunshine Act Meeting Notice→
Supporting & Related Material· Jul 9, 2026
PM ISA Supplement Final Report- 2022 - Copy→
Supporting & Related Material· Jul 9, 2026
EPA-Science Advisory Board-24-003→
Supporting & Related Material· Jul 9, 2026
Description of Proposal to Migrate Provisions for Nonconformance Penalties from 40 CFR part 86, subpart L, to 40 CFR part 1071→
Supporting & Related Material· Jul 9, 2026
estimating pm2.5- and ozone-attributable health benefits tsd 2024→
Supporting & Related Material· Jul 9, 2026
Regulatory Impact Analysis for the Repeal of the Clean Power Plan, and the Emission Guidelines for Greenhouse Gas Emissions from Existing Electric Utility Generating Units.→
Supporting & Related Material· Jul 9, 2026
final pm naaqs ria 2012→
Supporting & Related Material· Jul 9, 2026
2019 CATS 5885 REV DOC 2017 Cost Benefit Report 11 18 2019.docx→
Supporting & Related Material· Jul 9, 2026
Annual Energy Outlook 2025: Table 57 - Components of Selected Petroleum Product Prices→
Supporting & Related Material· Jul 9, 2026
NOX ISA Final January 2016 - Copy→
Supporting & Related Material· Jul 9, 2026
Cost Calculations for the Amendments and Nonconformance Penalties for Model Year 2027 and Later Heavy-Duty Highway Engines and Amendments to Inducement Provisions for SCR-Equipped Diesel Engines: Draft Regulatory Impact Analysis (DRIA)→
Supporting & Related Material· Jul 9, 2026
ISA Ozone Final 2020→
Supporting & Related Material· Jul 9, 2026
ISA PM Final 2019→
Supporting & Related Material· Jul 9, 2026
Email exchange with Nolan Willis→
Supporting & Related Material· Jul 9, 2026
EPA Launches Biggest Deregulatory Action in U.S. History - US EPA→
Supporting & Related Material· Jul 9, 2026
At Iowa State Fair, EPA Administrator Zeldin Announces Diesel Exhaust Fluid (DEF) Fix→