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

This page last reviewed July 2, 2019

Image of Truck 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 and Vehicles" (PDF - 248K), as of April 1, 2019 (last amended December 19, 2018)

     
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 - 755K), as of October 1, 2019 (last amended April 18, 2019)

 

Section 95663, Title 17, California Code of Regulations contains California's greenhouse gas exhaust emission standards for on-road heavy-duty vehicles, and the following test procedures, as incorporated by reference. 

  • “California Greenhouse Gas Exhaust Emission Standards and Test Procedures for 2014 and Subsequent Model Heavy-Duty Vehicles,” (PDF – 361K), as of April 1, 2019 (last amended December 19, 2018).
SCR Workshop for On Road Medium Duty and Heavy Duty Engines
The California Air Resources Board (ARB) staff invites you to participate in a public workshop regarding medium-heavy and heavy-heavy diesel engine certification requirements related to engines using SCR control technology for 2011 and later model year on-road heavy-duty diesel engines and off-road compression ignition engines. The presentation and other applicable handouts are available for download below.
Durability Demonstration Workshop for New Diesel Engines
The California Air Resources Board (ARB) staff invites you to participate in a public workshop regarding engine certification requirements related to engine durability demonstration for 2010 and later model year on-road heavy-duty diesel engines and off-road compression ignition engines meeting the Tier-4/Tier-4i certification standards. The presentation and other applicable handouts are available for download below.

Hearing Notices / Proposed Regulations / Related Programs
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 Hybrid Electric Vehicle Certification Procedures
 Find out about certification procedures specific to heavy-duty hybrid-electric vehicles.
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 ARB's Diesel toll free hotline at (866) 6DIESEL.
You will also find additional information by visiting a list of Diesel Informational Links.


Contact Us

(800) 242-4450  |  helpline@arb.ca.gov
1001 I Street, Sacramento, CA 95814
P.O. Box 2815, Sacramento, CA 95812

The California Air Resources Board is one of six boards, departments, and offices under the California Environmental Protection Agency.

Copyright © 2019 State of California

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