Verification Procedure

This page last reviewed December 7, 2009.

The Regulation for the Verification Procedure for In-Use Strategies to Control Emissions from Diesel Engines was created and adopted by our Board on May 16, 2002. The goal of the Verification Procedure is to ensure real emission reductions, along with an emission control system that is durable and compatible with various engines and applications.  The Air Resources Board does not charge a fee for Verification; however, all applicants should be aware that as part of the Verification process, it is the applicant’s responsibility to provide data to verify emission reduction claims.  This includes specific laboratory testing for which the applicant bears the total cost, along with robust in-use testing which is required after the diesel emission control devices have been in operation for a certain period of time.  Annual warranty reporting is also required by each manufacturer, for each of their verified products.

A number of criteria need to be considered when purchasing diesel exhaust retrofits known as "verified diesel emission control strategies" (DECS) or (VDECs) to comply with Air Resources Board (ARB) diesel regulations.  For additional information on selecting, installing and maintaining a DECS please visit the Heavy Duty DECS Installation/Maintenance page.

June 23, 2009

Public Notice to Discuss Proposed Amendments to the Verification Procedure.

January 1, 2009

As of January 1, 2009, all verified diesel retrofits sold and installed must comply with the 2009 nitrogen dioxide (NO2) emissions limit as defined in the Verification Procedure, Warranty and In-Use Compliance Requirements for In-Use Strategies to Control Emissions from Diesel Engines (the Procedure), title 13, California Code of Regulations, sections 2700-2710.  More information, including the conditional grace period for installation, can be found in Mail-Out #MSC 08-26.

January 24, 2008

The Air Resources Board will hold a public hearing January 24, 2008 and consider the proposed amendments to the Verification Procedure, Warranty and In-Use Compliance Requirements for In-Use Strategies to Control Emissions from Diesel Engines.  The proposed amendments include, but are not restricted to, conditional extensions for certain diesel emission control strategies (DECS), new transient testing requirements for DECS for off-road applications, and new requirements for DECS that control oxides of nitrogen.  The public hearing notice and Initial Statement of Reasons are located at the following link:
www.arb.ca.gov/regact/2008/verdev2008/verdev2008.htm

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