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Verified Technologies
Related Information
The table below lists the diesel retrofit technologies that EPA has approved for use in engine retrofit programs. The manufacturer link in the table may be selected to learn more about the retrofit technology and its operating criteria. The table shows the percent reduction (of verified or tested levels) that EPA will recognize for emission reductions for each technology. See the retrofit manufacturers contact page for more information on these manufacturers.
Each technology listed here meets the new NO2 emission limits that took effect January 2009. For information on the technologies that were removed from this table see the list of technologies that were formerly approved. More information on NO2 limits.
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 | |||
| BASF (formerly listed under Engelhard) | CMX Catalyst Muffler | Highway, heavy-duty, 4 cycle engines | 20 | 40 | n/a | 50 |
| Caterpillar, Inc. | Diesel Particulate Filter | Nonroad, 4 cycle, non-EGR equipped, model year 1996-2005, turbocharged engines with power ratings 130 ≤ KiloWatts < 225 (174.2 ≤ Horsepower < 301.5) | 89 | 90 | n/a | 93 |
| Caterpillar, Inc. | Emissions Upgrade Group | Caterpillar model 3306 diesel engines for nonroad applications with model years from 1988 to 1995 with mechanical direct fuel injection. | 22 | 13 | 37 | 71 |
Cummins Emission Solutions |
Cummins Emission Solutions & Cummins Filtration Diesel Oxidation Catalyst (DOC) and Closed Crankcase Ventilation (CCV) System | Highway, heavy-heavy and medium-heavy duty, 4 cycle, non-EGR, model year 1991 - 2003, turbocharged or naturally aspirated engines | 30a | 50 | n/a | 74 |
| Donaldson |
Series 6000 DOC & Spiracle (closed crankcase filtration system) | Highway, heavy heavy- and medium heavy-duty, 4 cycle, non-EGR, model year 1991 - 2003, turbocharged or naturally aspirated engines | 25 to 33 a | 13 to 23 | n/a | 50 to 52 |
| Donaldson |
Series 6100 DOC | Highway, heavy heavy- and medium heavy-duty, 4 cycle, non-EGR, model year 1991 - 2003, turbocharged or naturally aspirated engines | 20 to 26 | 38 to 41 | n/a | 49 to 66 |
| Donaldson |
Series 6100 DOC & Spiracle (closed crankcase filtration system) | Highway, heavy heavy- and medium heavy-duty, 4 cycle, non-EGR, model year 1991 - 2003, turbocharged or naturally aspirated engines | 28 to 32 a | 31 to 34 | n/a | 42 |
| Engine Control Systems | Purifilter Plus (Diesel particulate filter on the engine, electrical panel for active regeneration at the garage/maintenance yard) | Highway; heavy, medium, and light heavy-duty; Urban Bus; 4 cycle; model years 1994 - 2006; turbocharged or naturally aspirated; non-EGR engines | 90 | 75 | n/a | 85 |
| [Engine Control Systems]b | [Purifilter Plus (Diesel particulate filter on the engine, electrical panel for active regeneration at the garage/maintenance yard)]b | [Highway; heavy, medium, and light heavy-duty; Urban Bus; 4 cycle; model years 1994 - 2006; turbocharged or naturally aspirated; EGR engines]b | [90]b | [75]b | n/a | [85]b |
| Engine Control Systems |
Purifilter - Diesel Particulate Filter | Highway, heavy and medium heavy-duty; Urban Bus; 4 cycle; model years 1994 - 2003; turbocharged or naturally aspirated; non-EGR engines | 90 | 75 | n/a | 85 |
| Engine Control Systems | AZ Purimuffler or AZ Purifier Diesel Oxidation Catalyst with ECS closed crankcase ventilation (CCV) system with Low Sulfur Diesel Fuel |
Highway, heavy-duty, 4 cycle, mechanically or electronically injected, turbocharged or naturally aspirated, originally manufactured from 1991 through 2004 model years which meet a 5 or 4 g/bhp-hr NOx standard with open crankcase ventilation and no aftertreatment engines | 40a | 60 | n/a | 75 |
| Engine Control Systems | AZ Purimuffler or AZ Purifier Diesel Oxidation Catalyst with Low Sulfur Diesel Fuel |
Highway, medium heavy-duty, 4 cycle, model years 1991 - 2003 Cummins and Navistar/International engines originally manufactured with no aftertreatment, turbocharged or naturally aspirated, non-EGR engines | 40 | 40 | n/a | 70 |
| Engine Control Systems | AZ Purimuffler or AZ Purifier Diesel Oxidation Catalyst with Low Sulfur Diesel Fuel |
Highway, heavy heavy-duty, 4 cycle, model years 1991 - 1993 Cummins engines originally manufactured without exhaust aftertreatment, turbocharged or naturally aspirated, non-EGR engines | 35 | 40 | n/a | 70 |
| Engine Control Systems | AZ Purimuffler AZ Purifier |
Highway, heavy duty, 2 cycle engines | 20 | 40 | n/a | 50 |
| Engine Control Systems | AZ Purimuffler AZ Purifier |
Highway, heavy duty, 4 cycle engines | 20 | 40 | n/a | 50 |
| International Truck & Engine Corp. | Green Diesel Technology-Low NOx Calibration plus Diesel Oxidation Catalyst with Ultra Low Sulfur Diesel (ULSD) | Highway, light heavy-duty, 4 cycle, Navistar/International engines, model years 1999 - 2003 in the following families: XNVXH0444ANA, YNVXH0444ANB, 1NVXH0444ANB, 2NVXH0444ANB, 3NVXH0444ANB |
0 to 10 | 10 to 20 | 25 | 50 |
| Johnson Matthey | Advanced Catalyzed Continuously Regenerating Technology (ACCRT) System | 4-cycle, on-highway; light-, medium-, and heavy- heavy duty diesel engines including turbo-charged or naturally aspirated, EGR and non-EGR, and originally manufactured from 2002 through 2006 model years | 90 | 50 | n/a | n/a |
| Johnson Matthey | Continuously Regenerating Technology3 (CRT3) Particulate Filter | Highway, medium and heavy heavy-duty, 4 cycle, non-EGR, model year 1994 - 2006, turbocharged or naturally aspirated engines | 90 | 72 | n/a | 93 |
| Johnson Matthey | CEM™ Catalytic Exhaust Muffler and/or DCC™ Catalytic Converter | Highway, heavy-duty, non-urban bus, 4 cycle, non-EGR model year 1991 - 2003, turbocharged or naturally aspirated engines | 20 | 40 | n/a | 50 |
| Lubrizol | PuriNOx Water emulsion fuel |
Highway & Non-road, heavy-duty, 2 & 4 cycle | 16 to 58 | -35 to 33 | 9 to 20 | -30 to -120 |
| Various | Biodiesel (1 to 100%) | Highway, heavy-duty, 2 & 4 cycle | 0 to 47 | 0 to 47 | -10 to 0 | 0 to 67 |
| Various | Cetane Enhancers | Highway, heavy-duty, 4 cycle, non-EGR-equipped engines | n/a | n/a | 0 to 5 | n/a |
a - Total PM reduction figures reflect reductions from both tailpipe and crankcase emissions.
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.
In addition to the verified retrofit technologies listed above, EPA has verified certain idle reduction technologies, aerodynamic technologies, and low rolling resistance tires.
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.