This approach refers to installing advanced exhaust controls (retrofitting vehicles and equipment), or replacing (repowering) engines.
Of the three approaches, retrofitting is the most cost-effective strategy on a cost per ton of pollutant-reduced basis. Typically, diesel retrofits involve adding a device to remove emissions from the engine exhaust. Retrofits can be very effective, eliminating up to 90% of pollutants, depending on the device. Some examples of devices are diesel oxidation catalysts, diesel particulate filters and closed crankcase ventilation systems.
DEQ offers technical assistance on these approaches and can refer fleet managers to vendors and other resources for more information. Grant money may be available to help with costs.
If the retrofit project is for an on-road medium- or heavy-duty vehicle intended for a DEQ certification in accordance with the Oregon Department of Transportation registration and titling prohibitions (ORS 803.591), the retrofit technology must meet the criteria for DEQ-Approved Retrofit Technology. To participate in the program, the vehicle owner will need to agree to the program requirements and submit an application that includes approved retrofit installation and vehicle information.
Visit the Oregon Diesel Retrofit Compliance Program web page for more information.