Regulations for Smog, Soot, and Other Air Pollution from Passenger Cars & Trucks

• Overview
• List of related regulations

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Overview

On March 20, 2024, EPA issued new, more protective standards to further reduce harmful air pollutant emissions from light-duty and medium-duty vehicles starting with model year 2027. The final rule leverages advances in clean car technology to unlock benefits to Americans ranging from improving public health through reducing soot- and smog-forming pollution from vehicles, to reducing climate pollution, to saving drivers money through reduced fuel and maintenance costs. These standards will phase in over model years 2027 through 2032.

• Final Rule: Multi-Pollutant Emissions Standards for Model Years 2027 and Later Light-Duty and Medium-Duty Vehicles

Background

Passenger cars and trucks are regulated by EPA under "light-duty" vehicle programs. EPA regulates passenger vehicles to reduce the amount of harmful emissions. There are regulations for multiple aspects of passenger vehicles, including:

• Standards for exhaust and evaporative emissions;
• Control of hazardous air pollutants and air toxics; 
• National Low Emission Vehicle Program;
• CAP 2000 (Compliance Assurance Program);
• Onboard refueling vapor recovery; and
• Inspection and maintenance.

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List of Related Regulations

Below is a list of all regulations related to smog, soot, and other emissions from passenger cars and trucks.

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: Multi-Pollutant Emissions Standards for Model Years 2027 and Later Light-Duty and Medium-Duty Vehicles	2024/03
Proposed Rule: Multi-Pollutant Emissions Standards for Model Years 2027 and Later Light-Duty and Medium-Duty Vehicles	2023/04
Final Rule for Amendments Related to Tier 3 Motor Vehicle Emission and Fuel Standards	2016/04
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 Control of Emissions of Hazardous Air Pollutants From Mobile Sources: Default Baseline Revision	2005/10
Direct Final Rule for Fuel Economy Regulations for Automobiles: Technical Amendments and Corrections	2009/11
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 Air Pollution from Motor Vehicles: Tier 3 Motor Vehicle Emission and Fuel Standards	2014/04
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 on Ozone Transport Commission; Low Emission Vehicle Program for the Northeast Ozone Transport Region	1995/01
Final Rule for Control of Air Pollution From New Motor Vehicles and New Motor Vehicle Engines: State Commitments to National Low Emission Vehicle Program (62 pp, 591 K, About PDF)	1998/01
Final Rule for Control of Air Pollution From New Motor Vehicles and New Motor Vehicle Engines: Voluntary Standards for Light-Duty Vehicles	1997/06
Final Rule for Control of Air Pollution From Motor Vehicles and New Motor Vehicle Engines; Modification of Federal Onboard Diagnostic Regulations for Light-Duty Vehicles and Light-Duty Trucks; Extension of Acceptance of California OBD	1998/12
Final Rule for Control of Hazardous Air Pollutants From Mobile Sources: Early Credit Technology Requirement Revision	2008/10
Final Rule for Revisions and Additions to Motor Vehicle Fuel Economy Label	2011/07
Final Rule for Control of Air Pollution From New Motor Vehicles: Tier 2 Motor Vehicle Emissions Standards and Gasoline Sulfur Control Requirements	2000/02
Final Rule for Fuel Economy Labeling of Motor Vehicles: Revisions To Improve Calculation of Fuel Economy Estimates	2006/12
Final Rule for Control of Emissions of Hazardous Air Pollutants From Mobile Sources - 40 CFR Parts 80 and 86	2001/03
Final Rule for Control of Hazardous Air Pollutants From Mobile Sources - 40 CFR Parts 59, 80, 85, and 86	2007/02
Final Rule for Amendments Related to Tier 3 Motor Vehicle Emission and Fuel Standards	2016/04
Final Rule for Modification of Federal Onboard Diagnostic Regulations for: LD Vehicles, LD Trucks, MD Passenger Vehicles, Complete HD Vehicles and Engines Intended for Use in HD Vehicles Weighing 14,000 Pounds GVWR or Less	2005/12