Verification Procedure - Level 1

This page last reviewed November 4, 2011.

Level 1 verification is for those technologies achieving at least 25 percent or greater reduction in particulate matter. The current verified technologies are listed below. Please read the verification letter(s) below which provide additional information on the applicability of the device for your particular engine. Click on the link below each system for a list of engine families for which devices have been approved (engine series names are provided for reference in most cases). For more detailed information or to purchase the device, please contact the device manufacturer directly. New information will be posted as additional systems are verified. Please check periodically for updates.

PLEASE NOTE: Verifications are issued chronologically.  The most recently issued Executive Order is the one which is currently in effect and is listed below each manufacturer’s verification.  This Executive Order supersedes any previous Executive Orders for the same product.   Should you wish to view any previous Executive Orders for reference purposes related to a manufacturer’s verification, please click on the associated link below each description.

Engine Control Systems

The ARB has verified Engine Control System's AZ Purifier and AZ Purimuffler for certain 1991 to 2003 model year, medium heavy-duty Cummins and Navistar/International diesel engines used in on-road applications operating on ultra low sulfur diesel fuel. The verification has been extended to include certain 1973-1993 model year Detroit Diesel Corporation engines used in on-road applications operating on CARB diesel as well as certain Cummins and DDC heavy heavy-duty engines model year 1991-2002, four stroke, used in on-road applications with ultra low sulfur diesel fuel. The AZ Purifier and AZ Purimuffler uses a diesel oxidation catalyst to achieve a 25 percent reduction in particulate matter emissions, qualifying it for a Level 1 verification. Specific engine families and conditions for which AZ Purifier and AZ Purimuffler have been approved may be found in the Executive Order which is listed below.

The ARB has verified the following Engine Control System's AZ Purifier and AZ Purimuffler for 1996 to 2002 model year off-road diesel engines. The application includes off-road equipment at ports, railway yards, and other intermodal / freight operation. The verification requires the use of ultra low sulfur diesel fuel that contains a maximum of 15 ppm sulfur. The Executive Order includes restrictions for this verification. Please click on the link below for a list of engine families for which the system has been verified.

Donaldson Company

The Air Resources Board (CARB) has verified the Donaldson DCM Diesel Oxidation Catalyst (DOC) Muffler with Series 6000/6400 catalyst formulation for select 1988 through 1990 model year diesel engines used in on-road applications operating on standard CARB or lower sulfur content diesel fuel. The system employs a diesel oxidation catalyst to achieve at least a 25 percent reduction in particulate matter emissions, qualfying it for Level 1 plus verification. Specific engine families and conditions for which the DCM DOC Muffler with Series 6000/6400 catalyst formulation has been approved may be found in the Executive Order and attachment below.

The Air Resources Board (CARB) has verified the Donaldson DCM Diesel Oxidation Catalyst (DOC) Muffler with Series 6000/6400 catalyst formulation and Spiracle™ Closed Crankcase Ventilation (CCV) Filtration System for select 1988 through 1990 model year diesel engines used in on-road applications operating on standard CARB or lower sulfur content diesel fuel. The system employs a DOC with a CCV filtration system to achieve at least a 25 percent reduction in particulate matter emissions, qualifying it for Level 1 plus verification. Specific engine families and conditions for which the DCM DOC Muffler with Series 6000/6400 catalyst formulation and Spiracle™ Closed Crankcase Ventilation (CCV) Filtration System has been approved may be found in the Executive Order and attachment below.

The Air Resources Board (CARB) has verified the Donaldson DCM Diesel Oxidation Catalyst (DOC) Muffler with Series 6000/6400 catalyst formulation and Spiracle™ Closed Crankcase Ventilation (CCV) Filtration System for select 1991 through 2002 model year diesel engines used in on-road applications operating on standard CARB or lower sulfur content diesel fuel. The system employs a DOC with a CCV filtration system to achieve at least a 25 percent reduction in particulate matter emissions, qualifying it for Level 1 plus verification. Specific engine families and conditions for which the DCM DOC Muffler with Series 6000/6400 catalyst formulation and Spiracle™ Closed Crankcase Ventilation (CCV) Filtration System has been approved may be found in the Executive Order and attachment below.

The Air Resources Board (CARB) has verified the Donaldson DCM Diesel Oxidation Catalyst (DOC) Muffler with Series 6100 catalyst formulation for select 1994 through 2002 model year diesel engines used in on-road applications operating on 15 parts per million or lower sulfur content diesel fuel. The system employs a diesel oxidation catalyst to achieve at least a 25 percent reduction in particulate matter emissions, qualifying it for Level 1 plus verification. Specific engine families and conditions for which the DCM DOC Muffler with Series 6100 catalyst formulation has been approved may be found in the Executive Order and attachment below.

The Air Resources Board has verified the Donaldson DCM Diesel Oxidation Catalyst (DOC) Muffler with Series 6100 catalyst formulation and Spiracle™ Closed Crankcase Ventilation (CCV) Filtration System for select 1991 through 2002 model year diesel engines used in on-road applications operating on 15 parts per million or lower sulfur content diesel fuel. The system employs a DOC with a CCV filtration system to achieve at least a 25 percent reduction in particulate matter emissions, qualifying it for Level 1 plus verification. Specific engine families and conditions for which the DCM DOC Muffler with Series 6100 catalyst formulation and Spiracle™ CCV Filtration System has been approved may be found in the Executive Order and attachment below.

The ARB has verified the following Donaldson Company DCM diesel oxidation catalyst mufflers with 6000 Series catalyst formulation plus closed loop crankcase with Spiracle closed crankcase filtration system with California diesel or lower sulfur fuel strategy. This system may be used for some off-road four-stroke, turbocharged diesel engines ranging from 150 to 600 hp and has been verified to reduce emissions of diesel particulate matter by an average of at least 25 percent. This system may be used in yard tractors, large lift trucks, top picks, side picks and gantry cranes. Please click on the links below for a list of engine families for which the system has been approved:

Extengine Transport Systems

The ARB has verified the Extengine Transport Systems Advanced Diesel Emission Control (ADEC) system for 1991 to 1995 model year off-road Cummins 5.9-liter diesel engines from 150 to 200 horsepower, which are used in excavators, dozers, and loaders, all with rubber tires, and utility tractor rigs operating on standard CARB or ultra low sulfur diesel fuel. The ADEC system employs a diesel oxidation catalyst, selective catalytic reduction catalyst, and ammonia slip catalyst to achieve a 25 percent reduction in particulate matter emissions, qualifying it for a Level 1 verification. The system also achieves an 80 percent reduction in NOx emissions. Specific conditions for which the ADEC system has been approved may be found in the Executive Order posted below.

Viscon

The ARB has verified Viscon California’s fuel additive, Viscon, for 1985 through 1995 model year diesel engines used in off-road applications. Viscon is a fuel additive which will achieve at least 25 percent reduction in PM while not increasing NOx emissions by more than ten percent of the baseline emission level tested as required. Please read the Executive Order for conditions for which Viscon has been approved. 

Vycon

The ARB has verified the Vycon REGEN System for rubber-tired gantry (RTG) cranes equipped with Pre-Tier 1 (pre-1996 model year) off-road diesel engines or Tier 1, Tier 2, or Tier 3 certified off-road diesel engines. The Vycon REGEN System is a flywheel based energy storage device that achieves at least 25 percent diesel particulate matter emissions reduction and meets the January 2009 N02 limit, qualifying it for a Level 1 Plus verification. The device also reduces NOx emissions by at least 30 percent. The Executive Order below includes restrictions for this verification.