In-Use Off-Road Diesel-Fueled Fleets Regulation

This page last reviewed October 18, 2018

Overview, Answers, Fact sheets
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On July 26, 2007, the California Air Resources Board (CARB) 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 DOORS Hotline at (877) 59DOORS (877-593-6677).

Upcoming Trainings:

What's New?:

Posted October 18, 2018

Posted October 1, 2018
  • If you are interested in learning more about online reporting for the Off-Road Diesel Regulation, please join us for the DOORS Reporting webinar on December 5, 2018 11:00 AM PDT.
  • This webinar provides instructions for navigating and reporting several different actions in the DOORS online reporting system.  This webinar is specific to the Off-Road Diesel side of DOORS.  It will not cover reporting functions for the Large Spark-Ignition Fleet Regualtion.  The following topics will be discussed:  
  1. Overview of the Compliance Snapshot
  2. How to report engine repowers
  3. How to report low-use vehicles
  4. How to report public funding
  5. How to complete annual reporting
After registering, you will receive a confirmation email containing information about joining the webinar.

Posted January 9, 2018