In-Use Off-Road Diesel Vehicle Regulation

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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 call the diesel vehicle information hot line at (866) 6-DIESEL or (866) 634-3735. Enforcement Delayed: On February 11, 2010, ARB issued a delay of the regulation's NOx and PM requirements pending further notice. Reporting, labeling, idling and disclosure requirements are still in effect. For more information, please see the enforcement advisory.

What's New?

Posted December 22, 2011
Final Amended Off-Road Diesel Vehicel Regulation. On December 14, 2011, the Office of Administrative Law approved amendments to the regulations for In-Use Off-Road Diesel-Fueled Fleets (Off-Road regulation) and Large Spark-Ignition Engine Fleet Requirements (LSI Fleet regulation). The amendments became effective on that same day, December 14, 2011.  For more information on the amendments to both regulations, please see the website for this rulemaking here.

Posted Nov. 10, 2011
Final Rulemaking Package for the Amendments to the Off-Road and LSI Fleet Regulations. Staff has posted the Final Rulemaking Package for the amendments to the Off-Road and LSI Fleet regulations. The package was filed with the Office of Administrative Law (OAL) on October 28, 2011, and OAL has until December 14, 2011 to make a determination. The package includes the Final Statement of Reasons which includes ARB's responses to all comments received on the Off-Road and LSI Fleet regulations during the public comment periods.

Posted Sept. 30, 2011
Advisory on the Delay or Suspension of the Installation of Particulate Matter (PM) Filters. MSC Mail-Out 11-29 has been posted to address compliance when a manufacturer of a verified diesel PM filter suspends sales and installations of a PM filter, or requires its removal for a particular engine family.

For more information, please call the diesel vehicle information hot line at (866) 6-DIESEL or (866) 634-3735 or go to http://www.arb.ca.gov/msprog/ordiesel/ordiesel.htm.