Heavy-Duty Diesel Emission Control Strategy
Installation and Maintenance

This page last reviewed April 4, 2014

A verified DPF is required for regulatory credit toward in-use regulations for diesel engines operating in California

dpfinstallCurrently Verified Devices   Training / Videos
How to find and install DPFs   Frequently Asked Questions
DPF Care and Maintenance   Have a complaint?

Every day, on and off-road diesel engines create air pollutants that can adversely affect human health.  ARB requires engine manufacturers to meet strict pollution standards for newer engines.  However, fleet owners may need to install a verified diesel emission control strategy to clean up emissions from older, dirtier diesel engines.  A diesel emission control strategy is a technology that, if maintained properly, reduces harmful air pollution from diesel engine exhaust before it is emitted into the air. The most common technology used is a diesel particulate filter (DPF), also known as a soot filter or DECS, which substitutes for the original factory muffler.  ARB evaluates and approves DPFs to meet specific particulate matter or nitrogen oxide emission reductions.

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Related Advisories:

Advisories are brief policy documents produced by staff to clarify program policies and regulations.