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Formerly Verified Technologies
Related Information
This table illustrates the diesel retrofit technologies that do not meet, or information was not provided to demonstrate that they meet, the 2009 NO2 emissions limit, and are no longer verified.
List of retrofit technologies that are currently verified.
General statement regarding emissions from platinum-based fuel additives (PDF) (1 pg, 108K, EPA420-B-08-014, July 2008).
You will need Adobe Reader to view some of the files on this page. See EPA's PDF page to learn more.
| Manufacturer | Technology | Applicability | Reductions (%) | |||
|---|---|---|---|---|---|---|
| PM | CO | NOx | HC | |||
| Caterpillar, Inc. | Catalyzed Converter/Muffler (CCM) | Highway, heavy-heavy and medium-heavy duty, 4 cycle, non-EGR, model year 1998 - 2003, turbocharged or naturally aspirated engines | 20 | 20 | n/a | 40 |
| Clean Diesel Technologies, Inc. | Platinum Plus Purifier System (fuel borne catalyst plus DOC) |
Highway, medium heavy- and heavy heavy-duty, 4 cycle, model year 1988 - 2003, turbocharged or naturally aspirated engines | 25 to 50 | 16 to 50 | 0 to 5 | 40 to 50 |
| Clean Diesel Technologies, Inc. | Platinum Plus Fuel Borne Catalyst/Catalyzed Wire Mesh Filter (FBC/CWMF) System | Highway, medium heavy-duty, 4 cycle, model year 1991 - 2003, non-EGR, turbocharged or naturally aspirated engines | 55 to 76 | 50 to 66 | 0 to 9 | 75 to 89 |
| Engelhard | DPX Catalyzed Diesel Particulate Filter | Highway, heavy-duty, 4 cycle, model year 1994 - 2002, turbocharged or naturally aspirated engines | 60 | 60 | n/a | 60 |
| Engelhard | CMX Catalyst Muffler | Highway, heavy-duty, 2 cycle engines | 20 | 40 | n/a | 50 |
| Johnson Matthey | Partial Continuously Regenerating Technology2 (PCRT2) Particulate Filter | Highway, heavy-heavy and medium-heavy duty, 4 cycle, non-EGR, model year 1988 - 2003, turbocharged or naturally aspirated non-urban bus engines | 50 (MY1988-1993) 45 (MY1994-2003) |
68 | n/a | 92 |
| Johnson Matthey | Catalyzed Continuously Regenerating Technology (CCRT) Particulate Filter | Highway, heavy-duty, urban bus, 4 cycle, non-EGR model year 1994 - 2006, turbocharged or naturally aspirated engines. | 90 | 85 | n/a | 95 |
| Johnson Matthey | Continuously Regenerating Technology (CRT) Particulate Filter | Highway, heavy-duty, 4 cycle, model year 1994 - 2006, turbocharged or naturally aspirated engines | 90 | 85 | n/a | 95 |
| Johnson Matthey | CEM Catalyst Muffler | Highway, heavy-duty, 2 cycle engines | 20 | 40 | n/a | 50 |
| Paceco Corporation | MES diesel particulate filter (MES-DPF) | Pre-1996 nonroad, 4-cycle, heavy-duty diesel engines in the 225 - 450 kW (NR7) power range in electrical generation applications | 39 | 90 | n/a | 95 |
| PUREM | PMF Green-Tec Particulate Filter/Catalyst | Highway, medium-heavy duty up to 280 hp, 4 cycle, non-EGR, model year 1998 - 2003, turbocharged or naturally aspirated engines | 90 | 85 | n/a | 90 |
| PUREM | PMF Green-Tec 230 Particulate Filter/Catalyst | Highway, medium-heavy duty up to 230 hp, 4 cycle, non-EGR, model year 1998 - 2003, turbocharged or naturally aspirated engines | 90 | 80 | n/a | 95 |
Note: For after-treatment devices the reductions are based on the installation of the retrofit technology on engines that were originally produced without diesel oxidation catalysts or diesel particulate filters.
NO2 Limits
In a December 20, 2007 letter (PDF) (2 pp, 68K, December 2007) EPA announced that increases in nitrogen dioxide (NO2) from diesel retrofits verified through the EPA's National Clean Diesel Campaign would be limited to no more than 20 percent of the baseline engine NO2 levels. This requirement became effective on Jan. 1, 2009. EPA's NO2 policy was further clarified in a letter (PDF) (2 pp, 129K, September 2008) issued September 24, 2008.
Memorandum of Agreement (MOA) with California Air Resources Board (ARB)
The Environmental Protection Agency's (EPA's) Diesel Retrofit Program signed a Memorandum of Agreement (MOA) (PDF) (3 pp, 204KB, June 2004) with the State of California Air Resources Board (ARB) for the Coordination and Reciprocity in Diesel Retrofit Device Verification. The MOA establishes reciprocity in verifications of hardware or device-based retrofits, and further reinforces EPA's and ARB's commitment to cooperate on the evaluation of retrofit technologies. This agreement commits EPA and ARB to work toward accepting particulate matter (PM) and oxides of nitrogen (NOx) verification levels assigned by the other's verification programs. Additionally, as retrofit manufacturers initiate and conduct in-use testing, EPA and ARB agreed to coordinate this testing so data generated may satisfy the requirements of each program. This MOA is intended to expedite the verification and introduction of innovative emission reduction technologies. Additionally, this MOA should reduce the effort needed for retrofit technology manufacturers to complete verification.
In addition to the above list of EPA verified retrofit technologies, EPA recognizes and accepts those retrofit hardware strategies or device-based systems that have been verified by the California Air Resources Board (CARB). For more information read CARB's Verification Program 
which also has links to their list of verified technologies.