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Regulations for Emissions from Vehicles and Engines
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Regulations for Greenhouse Gas Emissions from Commercial Trucks & Buses

On this page:
  • Overview
  • Background
  • List of related regulations

Overview

Control of Air Pollution from New Motor Vehicles: Heavy-Duty Engine and Vehicle Standards

On March 28, 2022, EPA published a proposed rule that would set new, more stringent standards to reduce pollution from heavy-duty vehicles and engines starting in model year (MY) 2027. The proposed standards would significantly reduce emissions of smog- and soot-forming nitrogen oxides (NOx) from heavy-duty gasoline and diesel engines and set more stringent greenhouse gas (GHG) standards for certain commercial vehicle categories. This proposal is consistent with President Biden’s Executive Order, “Strengthening American Leadership in Clean Cars and Trucks” and would ensure the heavy-duty vehicles and engines that drive American commerce are as clean as possible while charting a path to advance zero-emission vehicles in the heavy-duty fleet.

The proposal also includes amendments regarding the confidentiality of certain information submitted to EPA for engines, vehicles, and equipment subject to emission standards and other requirements under the CAA. In addition, the proposal includes other limited amendments to the regulations that implement our air pollutant emission standards for other sectors (e.g., light-duty vehicles, marine diesel engines, locomotives, various types of nonroad engines, vehicles, and equipment).

Proposed Rule: Control of Air Pollution from New Motor Vehicles: Heavy-Duty Engine and Vehicle Standards

Clean Trucks Plan

On August 5, 2021, EPA announced plans to reduce greenhouse gas (GHG) emissions and other harmful air pollutants from heavy-duty trucks through a series of rulemakings over the next three years. The first rulemaking of this Clean Trucks Plan, set out in a proposal published on March 28, 2022 (see above), focuses on reducing criteria pollutant emissions and would apply to heavy-duty vehicles beginning in 2027. EPA is also developing two other commercial vehicle actions following President Biden’s Executive Order. The first will focus on light- and medium-duty vehicles and will address multi-pollutant emissions, including greenhouse gas emissions, for model year 2027 and later commercial pickup trucks and vans. The second will focus on greenhouse gas emissions for model year 2030 and later heavy-duty engines and vehicles. These two upcoming commercial vehicle rulemakings will provide an opportunity for EPA to fully consider how zero-emission vehicle technologies should be incorporated into the regulatory framework over the long term.

Clean Trucks Plan.

Improvements for Heavy-Duty Engine and Vehicle Test Procedures, and other Technical Amendments

Final Rule: Improvements for Heavy-Duty Engine and Vehicle Test Procedures


Background

Phase 1 GHG Rule for model years 2014-2018: In September 2011, in response to a Presidential Memorandum issued in May 2010, EPA in coordination with NHSTA issued greenhouse gas emissions and fuel economy standards for medium and heavy duty trucks manufactured in model years 2014-2018.

Phase 2 GHG Rule for model years 2019-2027: In October 2016, EPA and NHTSA jointly finalized Phase 2 standards for medium- and heavy-duty vehicles through model year 2027 that will improve fuel efficiency and cut carbon pollution to reduce the impacts of climate change, while bolstering energy security and spurring manufacturing innovation.


List of Related Regulations

Below is a list of all regulations related to GHG emissions from commercial trucks and buses. 

Click the regulation titles for additional information, including:
  • Rule summaries;
  • Regulatory impact analyses;
  • Comment summaries;
  • Rule histories; and 
  • Fact sheets.*

*Note: Rule-related materials vary by rule.

Regulation Title Regulation Date
(Year/Month)
Proposed Rule: Control of Air Pollution from New Motor Vehicles: Heavy-Duty Engine and Vehicle Standards 2022/03
Final Rule: Improvements for Heavy-Duty Engine and Vehicle Test Procedures 2021/06
Repeal of Emission Requirements for Glider Vehicles, Glider Engines, and Glider Kits 2017/11
Final Rule for Phase 2 Greenhouse Gas Emissions Standards and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles 2016/10
Direct Final Rule and Nonroad Technical Amendments for Heavy-Duty Engine and Vehicle 2013/06
Final Rule for Phase 1 Greenhouse Gas Emissions Standards and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles 2011/09

Related Topics

  • Regulations for Emissions from Onroad vehicles & engines
  • Greenhouse Gas (GHG) Emissions
  • Greenhouse Gas Emissions Model (GEM) for Medium- and Heavy-Duty Vehicle Compliance
  • Regulations for Smog, Soot, and Other Air Pollution from Commercial Trucks & Buses
  • Regulations for Emissions from Vehicles and Engines Home
  • Onroad
  • Nonroad
  • Greenhouse Gas
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Last updated on April 27, 2022