In-Use Off-Road Diesel Vehicle Regulation

This page last reviewed December 30, 2015


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On July 26, 2007, the Air Resources Board (ARB) adopted a regulation to reduce diesel particulate matter (PM) and oxides of nitrogen (NOx) emissions from in-use (existing) off-road heavy-duty diesel vehicles in California. Such vehicles are used in construction, mining, and industrial operations. The regulatory language and information on reporting and compliance tools can be accessed by clicking the quick links buttons above. For more information, please contact the Diesel Hotline.

What's New?:

Posted December 30, 2015
Posted December 10, 2015
  • Updated Frequently Asked Questions (FAQs) and DOORS User Guides are now available in the Off-Road Knowledge Center. The FAQs on Verified Diesel Emission Control Strategy (VDECS), VDECS Credit, Adding Vehicles, and Written Idling Policy Guidelines have been updated for clarification and to include guidance for fleets with Cleaire devices, along with the DOORS User Guides on How to Report Engine Repowers, How to Report Vehicles Which Have Been Sold or Retired, and How to View Equipment Identification Numbers (EINs) and Print or Export Vehicle and Engine Data to be consistent with DOORS updates.  These updated documents are available in the Knowledge Center.  
Posted November 9, 2015
  • Combined disclosure of regulation applicability (sales disclosure) language is now available for the Off-Road Regulation and Truck and Bus Regulation.  The Disclosure Frequently Asked Questions (FAQ) has been updated with combined disclosure language that meets the disclosure requirements for both the Off-Road Regulation and Truck and Bus Regulation.  
Posted September 8, 2015
  • Report a Non-Compliant Off-Road Fleet page available for public use. Individuals that see a non-compliant off-road fleet or unlabeled off-road vehicles may report the location of those non-compliant fleets or vehicles to ARB for possible enforcement action.  Reports may be submitted from the DOORS sign-in page or here.
Posted December 8, 2014
  • Fleet Average Calculator for Small Fleets has been made available for public use. The Small Fleet Average Calculator is for small-sized off-road fleets (2,500 or less total horsepower), and covers all compliance years. The calculator is available here. Fleet owners utilizing the calculator are advised to first read the User Guide in order to familiarize themselves with the calculator.
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Posted August 1, 2014
Posted April 29, 2014
  • Fleet Average Calculator for Medium Fleets has been made available for public use. The Medium Fleet Average Calculator is for medium-sized off-road fleets (2,501 to 5,000 total horsepower), and covers all compliance years. The calculator is available here. The calculator has also been updated with additional features to better aid large fleet owners in planning out their compliance strategies.

    Fleet owners utilizing the calculator are advised to first read the revised User Guide in order to familiarize themselves with the calculator.
Posted March 18, 2014
  • Fleet Average Calculator for Large Fleets has been updated and expanded. The fleet average calculator for large fleets has been expanded to include all compliance years out to January 1, 2023, and is available here. The calculator has also been updated with additional features to better aid large fleet owners in planning out their compliance strategies.

    The User Guide has been updated as well to reflect the changes to the calculator, and fleet owners are advised to read it before making use of the calculator.
Posted September 13, 2013
  • U.S. EPA authorization granted. ARB has received authorization from the United States Environmental Protection Agency (U.S. EPA) to enforce the In-Use Off-Road Diesel Vehicle Regulation, including the regulation’s performance requirements, such as turnover requirements and restrictions on adding older, dirtier Tier 0 and 1 vehicles.  Enforcement of the restrictions on adding Tier 0 and 1 vehicles will begin January 1, 2014.  Enforcement of the first fleet average requirements for large fleets (> 5,000 total fleet horsepower) will begin on July 1, 2014.  Regulatory Advisory 13-25 discusses further how ARB staff will proceed with the enforcement of the regulation.
Posted September 11, 2013




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