Working Together for Cleaner Air
Verification
Verified Technologies List
The lists below provide information about diesel retrofit technologies that EPA has approved or conditionally approved for use in engine retrofit programs and shows the percent reduction (of verified or tested levels) that EPA will recognize for emission reductions for each technology. Select the technology link in the list to learn more about the retrofit technology and its operating criteria. See the Technology Contact Page for contact information and links to the manufacturers.
SmartWay Technologies
Verified Retrofit Technologies
The list below provides information on the emission reduction performance as verified by the EPA. By inclusion, EPA does not guarantee any performance or claims by the manufacturer, and the assigned reduction levels are only applicable when the technology is installed and used in accordance with the criteria described. EPA verification is not an evaluation of a product's safety or compliance with other regulatory requirements. Manufacturers, installers, fleets and operators must comply with all applicable local, state and federal safety regulations.
| Manufacturer | Technology | Applicability | Reductions (%) | |||
|---|---|---|---|---|---|---|
| PM | NOx | HC | CO | |||
| BASF (formerly listed under Engelhard) | CMX Catalyst Muffler | Highway, heavy-duty, 4 cycle engines | 20 | n/a | 50 | 40 |
| Caterpillar, Inc. | Diesel Particulate Filter (DPF) | Nonroad, 4 cycle, non-EGR equipped, model year 1996-2005, turbocharged engines with power ratings 130 ≤ KiloWatts < 225 (174.2 ≤ Horsepower < 301.5) | 89 | n/a | 93 | 90 |
| Caterpillar, Inc. | Emissions Upgrade Group | Nonroad: Caterpillar model 3306 diesel engines for nonroad applications with model years from 1970 to 1995 with mechanical direct fuel injection. | 22 | 37 | 71 | 13 |
| 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 | 30* | n/a | 74 | 50 |
| Donaldson |
Series 6000 Diesel Oxidation Catalyst (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* | n/a | 50 to 52 | 13 to 23 |
| Donaldson |
Series 6100 Diesel Oxidation Catalyst (DOC) |
Highway, heavy heavy- and medium heavy-duty, 4-cycle, non-EGR, model year 1991 - 2003, turbocharged or naturally aspirated engines | 20 to 26 | n/a | 49 to 66 | 38 to 41 |
| Donaldson |
Series 6100 Diesel Oxidation Catalyst (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* | n/a | 42 | 31 to 34 |
| Donaldson |
Series 6400 Diesel Oxidation Catalyst (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 | 28* | n/a | 50 | 23 |
| Engine Control Systems (ECS) | AZC Purimuffler or AZC Purifier Diesel Oxidation Catalyst (DOC) | Highway, heavy-duty, 4 cycle engines 1994 through 2006 | 20 | n/a | 50 | 40 |
| Engine Control Systems (ECS) | AZM Purimuffler or AZM Purifier Diesel Oxidation Catalyst (DOC) | Highway, heavy-duty, 4 cycle engines 1991 through 2006 | 20 | n/a | 50 | 40 |
| Engine Control Systems (ECS) | AZC Purimuffler or AZC Purifier Diesel Oxidation Catalyst (DOC) with ECS Closed Crankcase Ventilation (CCV) System | Highway, heavy-duty, mechanically or electronically injected, turbocharged or naturally aspirated, originally manufactured from 1994 through 2006 model years which meet a 5 or 4 g/bhp-hr NOx standard | 25 | n/a | 50 | 40 |
| Engine Control Systems (ECS) | AZM Purimuffler or AZM Purifier Diesel Oxidation Catalyst (DOC) with ECS Closed Crankcase Ventilation (CCV) System | Highway, heavy-duty, 4-cycle, mechanically or electronically injected, turbocharged or naturally aspirated, originally manufactured from 1991 through 2006 model years which meet a 5 or 4 g/bhp-hr NOx standard. | 25 | n/a | 50 | 40 |
| Engine Control Systems |
Purifilter - Diesel Particulate Filter (DPF) |
Highway, heavy and medium heavy-duty; Urban Bus; 4-cycle; model years 1994 - 2003; turbocharged or naturally aspirated; non-EGR engines | 90 | n/a | 85 | 75 |
| Engine Control Systems | Purifilter Plus - Diesel particulate filter (DPF) 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 | n/a | 85 | 75 |
| Engine Control Systems | Purifilter Plus M - Diesel Particulate Filter (DPF) on the engine, electrical panel for active regeneration at the garage/maintenance yard | Highway; light, medium, and heavy heavy-duty EGR engines manufactured by International Truck and Engine Corporation with model years 2003-2009 | 90 | n/a | 30 | 75 |
| Engine Control Systems | AZ Purimuffler or AZ Purifier Diesel Oxidation Catalyst (DOC) with Low Sulfur Diesel Fuel (LSD) |
Highway, medium heavy-duty, 4-cycle, model years 1991 - 2003 Cummins and Navistar/International engines originally manufactured with no after treatment, turbocharged or naturally aspirated, non-EGR engines | 40 | n/a | 70 | 40 |
| Engine Control Systems | AZ Purimuffler or AZ Purifier Diesel Oxidation Catalyst (DOC) with ECS Closed Crankcase Ventilation (CCV) system with Low Sulfur Diesel Fuel (LSD) |
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 after treatment engines | 40* | n/a | 75 | 60 |
| Engine Control Systems | AZ Purimuffler or AZ Purifier Diesel Oxidation Catalyst (DOC) with Low Sulfur Diesel Fuel (LSD) |
Highway, heavy heavy-duty, 4-cycle, model years 1991 - 1993 Cummins engines originally manufactured without exhaust after treatment, turbocharged or naturally aspirated, non-EGR engines | 35 | n/a | 70 | 40 |
| Engine Control Systems | AZ Purimuffler AZ Purifier |
Highway, heavy duty, 2-cycle engines | 20 | n/a | 50 | 40 |
| Engine Control Systems | AZ Purimuffler AZ Purifier |
Highway, heavy duty, 4-cycle engines | 20 | n/a | 50 | 40 |
| International Truck & Engine Corp. | Green Diesel Technology-Low NOx Calibration plus Diesel Oxidation Catalyst (DOC) 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 | 25 | 50 | 10 to 20 |
| Johnson Matthey | Selective Catalytic Reduction Technology (SCCRT) | On-highway, 4-cycle, EGR and non-EGR, 250-500 hp heavy-duty diesel engines, originally manufactured from model years 1998 through 2006 | 90 | 70 | 90 | 85 |
| Johnson Matthey | Selective Catalytic Reduction Technology (SCRT) | On-highway, 4-cycle, non-EGR, 250-500 hp heavy-duty diesel engines, originally manufactured from model years 1994 through 2002 | 90 | 70 | 95 | 90 |
| Johnson Matthey | Advanced Catalyzed Continuously Regenerating Technology (AdvCCRT) System | Highway, 4-cycle; 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 | n/a | n/a | 50 |
| 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 | n/a | 93 | 72 |
| Johnson Matthey | CEM™ Catalytic Exhaust Muffler and/or DCC™ Catalytic Converter | Highway, heavy- duty, non-urban bus, 4-cycle, non-EGR, model year 1988 – 1997 turbocharged or naturally aspirated diesel engines | 20 | n/a | 50 | 40 |
| Johnson Matthey | CEM™ Catalytic Exhaust Muffler and/or DCC™ Catalytic Converter | Highway, heavy- duty, non-urban bus, 4-cycle, non-EGR, model year 1998 – 2003 turbocharged or naturally aspirated diesel engines | 25 | n/a | 50 | 40 |
| Johnson Matthey | CEM™ Catalytic Exhaust Muffler and/or DCC™ Catalytic Converter | Highway, heavy- duty, non-urban bus, 4-cycle, EGR equipped model year 2003, EGR and non-EGR model year 2004 – 2006 turbocharged or naturally aspirated diesel engines certified without a diesel oxidation catalyst | 20 | n/a | 50 | 40 |
| Lubrizol | PuriNOx Water emulsion fuel |
Highway & Nonroad, heavy-duty, 2 & 4-cycle | 16 to 58 | 9 to 20 | -30 to -120 | -35 to 33 |
| Nett Technologies, Inc. | BlueMAX 100 | Nonroad, 4-cycle, non-EGR diesel engines between 75–370 kW power ranges, originally manufactured from 1996 through 2008 and originally certified without a catalyst to EPA Tier 1, 2, or 3 standards | 0 | 65 | 90 | 85 |
| Various | Biodiesel (1-100%) | Highway, heavy-duty, 2 & 4-cycle | 0 to 47 | -10 to 0 | 0 to 67 | 0 to 47 |
| Various | Cetane Enhancers | Highway, heavy-duty, 4-cycle, non-EGR-equipped engines | n/a | 0 to 5 | n/a | n/a |
*Total PM reduction figures reflect reductions from both tailpipe and crankcase emissions.
Note: Reductions for after-treatment devices are based on installation of retrofit technologies on engines that were originally produced without diesel oxidation catalysts or diesel particulate filters.
Related Information and Links:
- Donaldson Diesel Multi-stage Filter (DMF): Safety Notice (PDF) (1 pg, 170K, EPA420-B-10-032, July 2010).
- Emissions from Platinum-based Fuel Additives: General statement (PDF) (1 pg, 110K, EPA420-B-08-014, July 2008).
- Formerly Verified Technologies: Technologies removed from the list.
- Nitrogen Oxide (NO2) Emission at Limits: Technologies listed above meet the current NO2 requirements.
- Announcement letter (PDF) (2 pp, 68K, December 2007)
- Clarification letter (PDF) (2 pp, 129K, September 2008)