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

• Overview
• List of related regulations

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.

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.