This approach refers to installing advanced exhaust controls (retrofitting
vehicles and equipment), or replacing (repowering) engines.
Of the three approaches (burn less fuel, burn cleaner fuel, burn fuels
cleaner), 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 fleets to
vendors and other resources for more information. Grant monies may be available
to help with costs.