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Verified Technologies for SmartWay and Clean Diesel

Reducing Harmful Diesel Emissions

Learn how using retrofit technologies reduces important pollutants.

SmartWay Technologies

EPA-verified technologies that save fuel and reduce emissions for:

Clean Diesel Technologies

graphic displaying vehicles moving from dirty smog into bright clean air

EPA-verified retrofit technologies save fuel and reduce emissions.

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