- USA-California: Diesel Risk Reduction Program
California ARBRisk management activities following the identification of diesel particulates as a toxic air contaminant in California. Covers all California diesel retrofit programs.
- USA: National Clean Diesel Campaign (NCDC)
EPAWeb site of the EPA’s clean diesel campaign, including heavy-duty diesel retrofit, funding assistance, verified technologies, news, and related information.
- USA: Environmental Technology Verification Program
EPA/RTIVerification statements and test reports of the EPA/ETV emission control technology verification program.
- Switzerland: FOEN Particulate Filter List
FOENList of filter systems and a list of engines that comply with the Ordinance on Air Pollution Control (OAPC) for construction machines.
- Japan: Tokyo Diesel Retrofit Program
City of TokyoWeb site of the Tokyo diesel program, in Japanese.