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EPA/OAR RIN: 2060-AU41 Publication ID: Fall 2021 
Title: Control of Air Pollution From New Motor Vehicles: Heavy-Duty Engine and Vehicle Standards 

Heavy-duty engines have been subject to emission standards for criteria pollutants, including particulate matter (PM), hydrocarbon (HC), carbon monoxide (CO), and oxides of nitrogen (NOx), for nearly half a century; however, current data suggest that the existing standards do not ensure full, in-use emission control. In particular, in-use engine NOx emission levels from heavy-duty vehicles can be significantly higher than their certified values under certain conditions. NOx emissions are major precursors of ozone and significant contributors to secondary PM2.5 formation. Ozone and ambient PM2.5 concentrations continue to be a nationwide health and air quality issue. Reducing NOx emissions from on-highway, heavy-duty trucks and buses is an important component of improving air quality nationwide and reducing public health and welfare effects associated with these pollutants, especially for vulnerable populations and in highly impacted regions. This action will evaluate data on current NOx emissions from heavy-duty vehicles and engines, and options available to improve control of criteria pollutant emissions through revised emissions standards. Additionally, this action will contain targeted greenhouse gas (GHG) reductions and evaluate ways to streamline existing requirements. This rulemaking will address significant public health and environmental justice concerns caused by pollution from internal combustion engines while supporting early introduction of zero emission technologies.

Agency: Environmental Protection Agency(EPA)  Priority: Economically Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: Yes  Unfunded Mandates: Undetermined 
CFR Citation: 40 CFR 86   
Legal Authority: 42 U.S.C. 7414 et seq. Clean Air Act   
Legal Deadline:  None

Statement of Need: This action follows petitions for a rulemaking on this issue from over 20 organizations including state and local air agencies from across the country.

Summary of the Legal Basis: CAA section 202(a)

Alternatives: EPA may request comment to address alternative options in the proposed rule.

Anticipated Costs and Benefits: Updating these standards will result in NOx reductions from mobile sources and could be one important way that allows areas across the U.S. to meet National Ambient Air Quality Standards for ozone and particulate matter. Updating the standards will also offer opportunities to reduce regulatory burden through smarter program design.

Risks: EPA will evaluate the risks of this rulemaking.

Action Date FR Cite
ANPRM  01/21/2020  85 FR 3306   
NPRM  01/00/2022 
Final Rule  12/00/2022 
Additional Information: .
Regulatory Flexibility Analysis Required: Undetermined  Government Levels Affected: Undetermined 
Federalism: Undetermined 
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.
Sectors Affected: 11 Agriculture, Forestry, Fishing and Hunting; 211112 Natural Gas Liquid Extraction; 324110 Petroleum Refineries; 325110 Petrochemical Manufacturing; 325193 Ethyl Alcohol Manufacturing; 325199 All Other Basic Organic Chemical Manufacturing; 333618 Other Engine Equipment Manufacturing; 335312 Motor and Generator Manufacturing; 336111 Automobile Manufacturing; 336112 Light Truck and Utility Vehicle Manufacturing; 336120 Heavy Duty Truck Manufacturing; 336211 Motor Vehicle Body Manufacturing; 336213 Motor Home Manufacturing; 336311 Carburetor, Piston, Piston Ring, and Valve Manufacturing; 336312 Gasoline Engine and Engine Parts Manufacturing; 336999 All Other Transportation Equipment Manufacturing; 423110 Automobile and Other Motor Vehicle Merchant Wholesalers; 424690 Other Chemical and Allied Products Merchant Wholesalers; 424710 Petroleum Bulk Stations and Terminals; 486910 Pipeline Transportation of Refined Petroleum Products; 493130 Farm Product Warehousing and Storage; 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:
Tuana Phillips
Environmental Protection Agency
Office of Air and Radiation
1200 Pennsylvania NW,
Washington, DC 20460
Phone:202 565-0074

Christy Parsons
Environmental Protection Agency
Office of Air and Radiation
USEPA National Vehicle and Fuel Emissions Laboratory,
Ann Arbor, MI 48105
Phone:734 214-4243