Attention Contractors! Off-Road Equipment Regulation Training Dates Set by CARB

The details below are from the California Air Resources Board (CARB) on Class 504 - In-Use Off-Road Diesel Vehicle Regulation Training:

The California Air Resources Board (ARB) is now offering new dates for Class 504: In-Use Off-Road Diesel Vehicle Regulation Training. This class will provide an overview of the Off-Road regulation, including the applicability of the regulation, requirements currently in effect, future compliance requirements, and an overview of the Diesel Off-Road Online Reporting System (DOORS).

The classes will be offered at the following dates and locations:

  • June 21, 2012: Colton, CA
  • June 26, 2012: San Diego, CA
  • June 27, 2012: Sacramento, CA (This class will also be webcast)

For more information about this class and to register online, please visit the following website:

Additional classes will be offered this fall, with dates and locations to be announced.


ARBís regulation for In-Use Off-Road Diesel Vehicles (Off-Road regulation) became effective under California law on June 15, 2008. This regulation is intended to reduce harmful emissions from diesel powered construction and mining vehicles operating in California. Fleets were required to initially report their off-road diesel vehicles to ARB in 2009 via the Diesel Off-road On-line Reporting System (DOORS). In addition, fleet owners are subject to restrictions on unnecessary idling and will be subject to accelerated replacement/repower requirements. In December 2011, major amendments to the Off-Road regulation, which include delaying the first compliance date to no earlier than January 1, 2014, became effective.

If you have any questions regarding off-road reporting, please contact the DOORS hotline at (877) 59-DOORS (877-593-6677) or by email at For further information on ARBís diesel vehicle and equipment regulations, please call the California Air Resources Board Diesel Hotline at 866-6DIESEL (866-634-3735). For further information about the Off-Road regulation, please visit the Off-Road regulation website at:

Site design by Chris Kennedy. Content copyright Construction Industry Air Quality Coalition.

Please review our privacy policy and terms of use.

Supported by the Southern California Industry Advancement Funds and other organizations throughout the state.