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This page last reviewed February 8, 2010

Truck and Bus Regulation

On-Road Heavy-Duty Diesel Vehicles (In-Use) Regulation

image of a truck


On December 12, 2008, the California Air Resources Board (ARB) approved a new regulation to significantly reduce emissions from existing on-road diesel vehicles operating in California. The regulation requires affected trucks and buses to meet performance requirements between 2011 and 2023.  By January 1, 2023 all vehicles must have a 2010 model year engine or equivalent.

At the board hearing held on December 9, 2009 the California Air Resources Board (ARB) directed staff to propose amendments to the Truck and Bus Regulation that would provide additional flexibility for fleets adversely affected by the economy.  The board asked staff to evaluate alternatives that would meet emission targets and to focus on smaller businesses. The Board also asked staff to consider changing the March 31, 2010 reporting date (except agricultural fleets and fleets with two engine sweepers) to provide more time for fleets to submit their vehicle information.  Staff is now preparing its analysis and will be drafting suggested amendments for review.  Staff plans to hold public workshops in early 2010 to obtain stakeholder input.

The regulation applies to all on-road heavy-duty diesel fueled vehicles with a gross vehicle weight rating (GVWR) greater than 14,000 pounds, agricultural yard trucks with off-road certified engines, and certain diesel fueled shuttle vehicles of any GVWR. Out-of-state trucks and buses that operate in California are also subject to the regulation.  For further information, please call 866-6DIESEL (866-634-3735) or email at: 8666diesel@arb.ca.gov.  The regulation does not apply to trucks entering ports and intermodal railyards that comply with Drayage Truck Regulation.

Early reporting (deadline March 31, 2010) is required for fleets who wish to take advantage of special provisions for agriculture vehicles, retirement credits, early installation of particulate filters, and those fleets that operate dual-engine sweepers.  For more information on the agriculture vehicle provisions, please review Facts About Truck and Bus Regulation Agriculture Vehicle Provisions.

Special provisions to delay requirements are available for small fleets, vehicles operating in clean air areas, for low use vehicles, and for other situations.  Small fleets with three or fewer vehicles do not have to report until January 1, 2011 and do not have clean-up requirements until January 1, 2014.  For more information on small fleets special provisions, please review Facts About Small Fleet Provisions.  For more information on other special provisions of the regulation, please review Facts About Truck and Bus Regulation Special Provisions.


What's New:


Free Training Seminars on the Truck and Bus Regulation and the Tractor and Trailer Greenhouse Gas Regulation
(Posted February 8, 2010)
  • Staff has posted dates for a series of public training seminars to discuss the requirements for the Truck and Bus regulation and the Tractor and Trailer Greenhouse Gas regulation.  The reporting deadline for fleets who wish to take advantage of agricultural vehicle provision, and for fleets that operate two-engine sweepers with Tier 0 auxiliary engines, is March 31, 2010.  The training will help all fleets who wish to use ARB's compliance tools for compliance planning and reporting.  The training seminars will be held at various locations in the day and in the evening.  The training seminars will also be webcast on February 16, March 2, and March 18.  

Workshop to discuss the proposed admendments to the Truck and Bus regulation
(Posted January 14, 2010)
  • Staff has posted dates for workshops to discuss proposed amendments to the Truck and Bus regulation.  The dates and locations are January 20, 2010 in El Monte, January 25, 2010 in Sacramento and January 26, 2010 in Fresno.  The Sacramento workshop will be webcast, and live video feed has been set up for alternative locations (Modesto and Bakersfield) to telecast the Fresno workshop.

The Effect of the Recession on Trucking Emissions (Posted December 29, 2009)
  • Staff has posted information that provided the basis for the presentation of "The Effect of the Recession on Trucking Emissions" presented at the December 9, 2009 Board Hearing. This information documents staff's analysis of the impacts of the recession on trucking activity and resulting emissions. To view, go to http://www.arb.ca.gov/msprog/onrdiesel/workshops.htm.

The 2010 Truck and Bus reporting forms available (Posted December 16, 2009)
  • The 2010 Truck and Bus Reporting Forms are now available for downloading for fleets that require reporting by March 31, 2010.  This includes fleets with qualifying agricultural vehicles, fleets that wish to take advantage of the vehicle retirement credits provision, fleets that operate two engine sweepers, and fleets that have installed diesel PM filters and want to claim early credits. Agricultural fleets reporting on March 31, 2010 must provide the odometer reading of their vehicles as of January 1, 2010.  Two engine sweepers having Tier 0 auxiliary engine must provide hour-meter reading as of January 1, 2010.

The Truck and Bus regulation was approved by the Office of Administrative Law on December 9, 2009 (Posted December 10, 2009)
  • The first reporting deadline is March 31, 2010 for fleets with qualifying agricultural vehicles, fleets that wish to take advantage of the vehicle retirement credits, fleets that operate two engine sweepers, and fleets that have installed PM filters and want to claim early credits. Agricultural fleets reporting on March 31, 2010 must provide the odometer reading of their vehicles as of January 1, 2010.
  • At the board hearing held on December 9, 2009 the California Air Resources Board (ARB) directed staff to propose amendments to the Truck and Bus Regulation that would provide additional flexibility for fleets adversely affected by the economy.  The board asked staff to evaluate alternatives that would meet emission targets and to focus on smaller businesses. The Board also asked staff to consider changing the March 31, 2010 reporting date (except agricultural fleets and fleets with two engine sweepers) to provide more time for fleets to submit their vehicle information.  Staff is now preparing its analysis and will be drafting suggested amendments for review.  Staff plans to hold public workshops in early 2010 to obtain stakeholder input.
  • To receive updates on meeting workshops and proposed amendments, please sign up for our email listserv

Workshop on Impacts of the Economy on Emissions   (Posted November 19, 2009)
  • Staff invites you to participate in a workshop scheduled for December 3, 2009 to discuss what the impact of reduced economic activity is having on emissions from diesel-fueled trucks operating in California.  Staff will also discuss potential impact of economic recovery scenarios on future emissions.

Formation of TRAC Small Business Subcommittee and Solicitation for Membership in Subcommittees (Posted November 17, 2009)
  • We are inviting interested parties to apply for membership in a new Small Business Subcommittee as part of ARB's Truck Regulation Advisory Committee (TRAC).  This new subcommittee will focus on obtaining stakeholder feedback on ARB's regulatory implementation and outreach related to small businesses.  The Small Business Subcommittee invitation letter and the application have been posted.  The application deadline is December 18, 2009.  
  • ARB staff is also looking for additional participation in the Reporting and Agriculture Subcommittees.  We are looking for about 10 additional members in each subcommittee.  If you are interested, we have posted the Reporting and Agriculture Subcommittee application.  The application deadline is also December 18, 2009.  

November 10th TRAC Meeting (Posted November 5, 2009)
  • On Tuesday, November 10th, will be the second meeting of the Truck Regulations Advisory Committee (TRAC) and its designated subcommittees.  The main TRAC meeting will be held from 3- 5 PM in the Sierra Hearing Room at the Cal/EPA Building and webcast.  For webcast information, please visit Cal/EPA Live Webcasts.  For a complete agenda of the day’s events please visit the new TRAC website

Final Rulemaking Package (Posted October 26, 2009)
  • Staff have posted the Final Rulemaking Package for the In-Use On-Road Diesel Vehicle Regulation (Truck and Bus Regulation). The package was filed with the Office of Administrative Law (OAL) on October 23, 2009, and OAL has until December 9, 2009, to make a determination.  The package includes the Final Statement of Reasons which includes ARB's responses to all comments received on the regulation during the public comment periods. The package for the amendments to the existing regulations was filed with the Office of Administrative Law (OAL) on October 19, 2009, and OAL has until December 3, 2009, to make a determination. 

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