Skip to main content
U.S. flag

An official website of the United States government

Here’s how you know

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

HTTPS

Secure .gov websites use HTTPS
A lock (LockA locked padlock) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

    • Environmental Topics
    • Air
    • Bed Bugs
    • Chemicals and Toxics
    • Climate Change
    • Emergency Response
    • Environmental Information by Location
    • Environmental Justice
    • Greener Living
    • Health
    • Land, Waste, and Cleanup
    • Lead
    • Mold
    • Pesticides
    • Radon
    • Science Topics
    • Water Topics
    • A-Z Topic Index
    • Laws & Regulations
    • By Business Sector
    • By Topic
    • Compliance
    • Enforcement
    • Guidance
    • Laws and Executive Orders
    • Regulations
    • Report a Violation
    • Environmental Violations
    • Fraud, Waste or Abuse
    • About EPA
    • EPA Administrator
    • Organization Chart
    • Staff Directory
    • Planning, Budget, and Results
    • Jobs and Internships
    • Headquarters Offices
    • Regional Offices
    • Lab and Research Centers
Contact Us

Verified Technologies for SmartWay and Clean Diesel

  • Reducing Harmful Diesel Emissions

    Learn how using retrofit technologies reduces important pollutants. 

SmartWay Technologies

SmartWay logo
EPA-verified technologies that save fuel and reduce emissions for:
  • Trucks and school buses
  • Locomotives
  • Marine technology
Related Topics
  • SmartWay Program 
  • Clean Diesel Program
  • Ports Initiative
  • State and Local Transportation
  • Heavy Duty Regulations and Standards
  • Fuels Registration, Reporting, and Compliance Help
  • CARB Verification 

Clean Diesel Technologies

graphic displaying vehicles moving from dirty smog into bright clean air
EPA-verified retrofit technologies save fuel and reduce emissions.
  • Learn about
  • Verification process
  • Verified list
  • Formerly verified list
  • Contact list for verified technologies

View the site map.

If you didn’t find the information you were looking for, you may want to search EPA’s Web Archive.

What's New

Updated Guidance on Tire size

Updated Retread Verification Protocols (pdf) (February 2022)

List of Verified Technologies
  • Aerodynamic Devices
  • Clean Diesel and Marine Technology
  • Low Rolling Resistance New and Retread Tire Technologies
  • Idling Reduction Technologies for Trucks and School Buses
  • Locomotives
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on March 24, 2022
United States Environmental Protection Agency

Discover.

  • Accessibility
  • Budget & Performance
  • Contracting
  • EPA www Web Snapshot
  • Grants
  • No FEAR Act Data
  • Plain Writing
  • Privacy
  • Privacy and Security Notice

Connect.

  • Data.gov
  • Inspector General
  • Jobs
  • Newsroom
  • Open Government
  • Regulations.gov
  • Subscribe
  • USA.gov
  • White House

Ask.

  • Contact EPA
  • EPA Disclaimers
  • Hotlines
  • FOIA Requests
  • Frequent Questions

Follow.