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This page last reviewed March 2, 2009

NOTICE
For information regarding the
STATEWIDE TRUCK AND BUS REGULATION,
click on the link above or call 1-866-6-DIESEL (1-866-634-3735)

On-Road Heavy-Duty Vehicle Program

Emissions from on-road heavy-duty vehicles are major contributors to poor air quality in California. In particular, diesel vehicles produce emissions in amounts highly disproportionate to the total population of these vehicles. The problem is complicated by the large number of heavy-duty vehicles, like line haul trucks, registered in other states that travel on California's highways and roads, while bringing goods and commerce into and out of our state. The Air Resources Board is working closely with the U.S. Environmental Protection Agency, engine and vehicle manufacturers, and other interested parties to address this issue and reduce heavy-duty vehicle emissions in California. Although this program targets both diesel-cycle and otto-cycle engines, more recent attention has been focused on diesel engines due to the identification of diesel PM as a known carcinogen.

Current Standards, Test Procedures and Regulatory Documents

Section 1956.8, Title 13, California Code of Regulations contains California's emission standards for on-road heavy-duty engines and vehicles, and the following test procedures, as incorporated by reference.

Heavy-Duty Otto-Cycle Engines and Vehicles

"California Exhaust Emission Standards and Test Procedures for 1987 through 2003 Model Heavy-Duty Otto-Cycle Engines and Vehicles" (WP6 - 67K) or (PDF - 86K), as amended on December 27, 2000
"California Exhaust Emission Standards and Test Procedures for 2004 and Subsequent Model Heavy-Duty Otto-Cycle Engines" (PDF - 103K), as amended on October 17, 2007

Heavy-Duty Diesel Engines and Vehicles

"California Exhaust Emission Standards and Test Procedures for 1985 through 2003 Model Heavy-Duty Diesel Engines and Vehicles" (MSW97 - 225K) or (PDF - 102K), as amended on December 12, 2002
"California Exhaust Emission Standards and Test Procedures for 2004 and Subsequent Model Heavy-Duty Diesel Engines and Vehicles" (PDF - 316K), as amended on October 14, 2008

Hearing Notices / Proposed Regulations / Related Programs

ATCM to Limit Diesel-Fueled Commercial Motor Vehicle Idling	Find out about an airborne toxic control measure designed to limit idling of diesel-fueled commercial heavy-duty vehicles and buses (excluding school buses).
Heavy-Duty Diesel Vehicle Idling Reduction Program	Find out about a program designed to reduce idling emissions from new heavy-duty diesel vehicles and emissions from auxiliary power units used as alternatives to heavy-duty vehicle idling.
Software Upgrade for Diesel Trucks	Find out about low NOx software upgrades for diesel engines and links to information about ARB and CTA activities to promote its use.
Heavy-Duty Diesel Engine In-Use Compliance Program	Find out about the development of an in-use compliance program for heavy-duty diesel engines.
2007 and Subsequent Model Year Heavy-Duty Diesel Engines / Vehicles Regulations	Find out about the reduced emission standards for 2007 and subsequent model year heavy-duty diesel engines that went to the Board on October 25, 2001.
2005 Not-to-Exceed (NTE) and Euro III European Stationary Cycle (ESC) Supplemental Test Procedures	Find out about the 2005 NTE and ESC Supplemental Test Procedures that went to the Board on December 8, 2000.
2004 Heavy-Duty Diesel Engines / Vehicles Regulations	Find out about the 2004 Heavy-Duty Vehicle Emission Standards and Regulations. This regulation went to the Board on April 23, 1998.
Public Bus Fleet Rule and Engine Standards.	Find out about ARB's Public Transit Bus Fleet Rule and Engine Standards that went to the Board on February 24, 2000.
School Bus Program	Find out about ARB's grant program -- the Lower Emission School Bus Program and school bus idling restrictions.
California's Diesel Risk Reduction Program	Find out about how California plans to reduce the risk from existing heavy-duty diesel vehicles by reducing diesel PM.
Heavy-Duty Vehicle and Engine Certification	Find out about the certification of heavy-duty vehicles and engines.
Heavy-Duty Vehicle Inspection and Periodic Smoke Inspection Programs	Find out about ARB's Heavy-Duty Vehicle Inspection and Periodic Smoke Inspection programs.

Where Can I Get More Information?

For more information, please contact Stephan Lemieux at (626) 450-6162 or via email at slemieux@arb.ca.gov.

You will also find additional information by visiting a list of Diesel Informational Links.

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