In-Use Off-Road Diesel-Fueled Fleets Regulation

This page last reviewed July 28, 2016


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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.