Heavy-Duty Diesel Emission Control Strategy (DECS)
Installation and Maintenance
Background:
This page provides links to documents and general guidance to operators of diesel vehicles or equipment who are interested in purchasing Diesel Emission Control Strategies (DECS) to comply with Air Resources Board in-use diesel regulations.
A DECS is a technology that reduces harmful air pollution from diesel engine exhaust before it is emitted into the air. The most common technology used as a DECS is a diesel particulate filter that substitutes for the original factory muffler. ARB evaluates and approves DECS to meet specific particulate matter or nitrogen oxide emission reductions.
To receive regular updates on advisories, training, or workshops regarding ARB in-use regulations, please subscribe to the appropriate Mobile Source e-mail list server.
Related Advisories:
Advisories are brief policy documents produced by staff to clarify program policies and regulations.







