In-Use Off-Road Diesel-Fueled Fleets Regulation

This page last reviewed September 6, 2017


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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 1-877-59-DOORS (1-877-593-6677).

Upcoming Deadlines:

January 1, 2018
  • Large (>5,000hp) and medium (2,501-5,000hp) fleets must meet emission performance requirements and are prohibited from adding any tier 2 engine vehicles to their fleet.
  • Small fleets (2,500hp) no longer receive double credit for installing a highest level PM Verified Diesel Emission Control Strategy (VDECS) or VDECS verified to reduce NOx.
March 1, 2018
  • All fleets are required to complete their annual reporting requirements and submit a Responsible Official Affirmation of Reporting (ROAR) form.  For more information on the annual reporting requirements of the Off-Road Regulation, please see the ROAR and Annual Reporting FAQ.

Upcoming Trainings:

Posted June 29, 2017

What's New?:

Posted July 18, 2017
Posted April 19, 2017

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