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.

Emergency

This is not the current EPA website. To navigate to the current EPA website, please go to www.epa.gov. This website is historical material reflecting the EPA website as it existed on January 19, 2025. This website is no longer updated and links to external websites and some internal pages may not work. More information »

    • Environmental Topics
    • Air
    • Bed Bugs
    • Cancer
    • Chemicals, Toxics, and Pesticide
    • Climate Change
    • Emergency Response
    • Environmental Information by Location
    • Environmental Justice
    • Greener Living
    • Health
    • Land, Waste, and Cleanup
    • Lead
    • Mold
    • Radon
    • Research
    • Science Topics
    • Water Topics
    • A-Z Topic Index
    • Laws & Regulations
    • By Business Sector
    • By Topic
    • Compliance
    • Enforcement
    • Laws and Executive Orders
    • Regulations
    • Report a Violation
    • Environmental Violations
    • Fraud, Waste or Abuse
    • About EPA
    • Our Mission and What We Do
    • Headquarters Offices
    • Regional Offices
    • Labs and Research Centers
    • Planning, Budget, and Results
    • Organization Chart
    • EPA History
    • Staff Directory

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

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

Technical Resources

TRU Emissions Calculator

Research and tools that may help fleets and technology developers.

  • Transport Refrigeration Unit Calculator
  • Tractor-Trailer Geometries for CFD



     
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

What's New

  • Tractor-Trailer Geometries for CFD
  • Refrigerated Trailers and Transport Refrigeration Units (TRU) Calculator
  • Tire casings used in retread testing
Related Topics
  • SmartWay Program
  • Diesel Emission Reduction Act (DERA) Program
  • Ports Initiative
  • State and Local Transportation
  • Heavy Duty Regulations and Standards
  • Fuels Registration, Reporting, and Compliance Help
  • CARB Verification

View the site map.

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

Contact Us about Verified Technologies for SmartWay and Clean Diesel to ask a question, provide feedback, or report a problem.
Last updated on November 21, 2024
  • Assistance
  • Ayuda
  • Arabic
  • Chinese (simplified)
  • Chinese (traditional)
  • Aide
  • Asistans
  • Korean
  • Assistência
  • Russian
  • Tulong
  • Vietnamese
United States Environmental Protection Agency

Discover.

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

Connect.

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

Ask.

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

Follow.