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Regulations for Emissions from Vehicles and Engines

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Regulations for Smog, Soot, and Other Air Pollution from Commercial Trucks & Buses

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Overview

EPA regulates commercial trucks and buses as onroad "heavy-duty." Most of the regulations are related to diesel engines, but there are also regulations that to gasoline-fueled and other spark-ignition engines. The requirements apply to engines installed in all vehicles with Gross Vehicle Weight Rating above 14,000 pounds, and to some engines installed in vehicles with Gross Vehicle Weight Rating between 8,500 and 14,000 pounds. 

List of Petitions

On November 13, 2018, EPA announced the Cleaner Trucks Initiative, which will include a future rulemaking to establish updated standards to address nitrogen oxide (NOx) emissions from highway heavy-duty trucks and engines. 

Petitions requesting an updated NOx standard for heavy duty trucks and buses are below.  For other petitions involving the Office of Air and Radiation, please visit: Petitions to the Office of Air and Radiation.

Petitions Title Petitions Date
(Year/Month)
Petitions for Revised NOx Standards for On-highway Heavy-duty Engines and Trucks 2016/12

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List of Related Regulations

Below is a list of all regulations related to smog, smoot, and other air pollution from commercial trucks and buses. 

Help

For help on using the table:
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)
Final Rule for Control of Air Pollution From New Motor Vehicles and New Motor Vehicle Engines; Non-Conformance Penalties for 2004 and later Model Year Emission Standards for Heavy-Duty Diesel Engines and Heavy-Duty Diesel Vehicles 2002/08
Amendments Related to Tier 3 Motor Vehicle Emission and Fuel Standards, Nonroad Engine and Equipment Programs, and MARPOL Annex VI Implementation 2015/05
Final Rule for Emergency Vehicle Rule—SCR Maintenance and Regulatory Flexibility for Nonroad Equipment 2014/08
Direct Final Rule for Heavy-Duty Highway Program: Revisions for Emergency Vehicles 2012/06
Direct Final Rule for In-Use Testing for Heavy-Duty Diesel Engines and Vehicles; Emission Measurement Accuracy Margins for Portable Emission Measurement Systems and Program Revisions 2008/03
Final Rule for Control of Air Pollution From New Motor Vehicles and New Motor Vehicle Engines; Regulations Requiring Onboard Diagnostic Systems on 2010 and Later Heavy-Duty Engines Used in Highway Applications Over 14,000 Pounds 2009/02
Final Rule for Control of Emissions of Air Pollution From New Motor Vehicles: In-Use Testing for Heavy-Duty Diesel Engines and Vehicles 2005/06
Direct Final Rule for Amendments to Regulations for Heavy-Duty Diesel Engines 2006/08
Final Rule for Control of Emissions of Air Pollution from 2004 and Later Model Year Heavy-Duty Highway Engines and Vehicles; Revision of Light-Duty On-Board Diagnostics Requirements 2000/10
Final Rule for Control of Emissions of Air Pollution From Highway Heavy-Duty Engines 1997/10
Direct Final Rule for Revisions to In-Use Testing for Heavy-Duty Diesel Engines and Vehicles; Emissions Measurement and Instrumentation; Not-to-Exceed Emission Standards; and Technical Amendments for Off-Highway Engines 2010/11
Final Rule for Modification of Federal Onboard Diagnostic Regulations for: Light-Duty Vehicles, Light-Duty Trucks, Medium-Duty Passenger Vehicles, Complete Heavy-Duty Vehicles and Engines Intended for Use in Heavy-Duty Vehicles Weighing 14,000 Pounds GVWR 2005/10
Direct Final Rule for Control of Air Pollution From New Motor Vehicles; Revisions to Motor Vehicle Diesel Fuel Sulfur Transition Provisions; and Technical Amendments to the Highway Diesel, Nonroad Diesel, and Tier 2 Gasoline Programs 2005/11
Final Rule for Control of Air Pollution from Motor Vehicles: Tier 3 Motor Vehicle Emission and Fuel Standards 2014/04
Final Rule for Control of Air Pollution from New Motor Vehicles: Heavy-Duty Engine and Vehicle Standards and Highway Diesel Fuel Sulfur Control Requirements 2001/01
Final Rule for Clean Alternative Fuel Vehicle and Engine Conversions 2011/04
Final Rule for Emission Durability Procedures for New Light-Duty Vehicles, Light-Duty Trucks and Heavy-Duty Vehicles 2006/01
Final Rule for Nonconformance Penalties for On-Highway Heavy-Duty Diesel Engines 2012/09
Final Rule for Greenhouse Gas Emissions Standards and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles 2011/09
Final Rule for on Ozone Transport Commission; Low Emission Vehicle Program for the Northeast Ozone Transport Region 1995/01

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