Heavy-Duty Diesel Emission Control Strategy
Installation and Maintenance
A verified DPF is required for regulatory credit toward in-use regulations for diesel engines operating in California
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
oxide emission reductions.
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Advisories are brief policy documents produced by staff to clarify program policies and regulations.