Subject Top Page: New Off-Road Compression-Ignition (Diesel) Engines and Equipment

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This page last reviewed September 26, 2006

New Off-Road Compression-Ignition (Diesel) Engines and Equipment

This category consists of new compression-ignition engines (a.k.a. diesel engines) that are found in a wide variety of off-road applications such as farming, construction, and industrial. Some familiar examples include tractors, excavators, dozers, scrapers, portable generators, transport refrigeration units (TRUs), irrigation pumps, welders, compressors, scrubbers, and sweepers. This category, however, does not include locomotives, commercial marine vessels, marine engines over 37 kilowatts (kW), or recreational vehicles.

For information regarding ARB's program to reduce particulate matter (PM) emissions from existing off-road diesel equipment, please go here.

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What's New

Posted April 20, 2005:
	Draft 15-day modifications to the off-road diesel Tier 4 regulations are now available. For more information please use the following link.

Posted January 19, 2005:
	On December 9, 2004, the Board adopted a fourth phase of emission standards (Tier 4) that are nearly identical to those finalized by the U.S. EPA on May 11, 2004, in its Clean Air Nonroad Diesel Rule. As such, engine manufacturers are now required to meet aftertreatment-based exhaust standards for particulate matter (PM) and NOx starting in 2011 that are over 90 percent lower than current levels, putting off-road engines on a virtual emissions par with on-road heavy-duty diesel engines. Fore more information please use the following link.

Posted November 14, 2004:
	ARB is starting work on a rule to reduce particulate matter (PM) emissions from existing off-road diesel equipment in California.

Posted October 20, 2004:
	The Staff Report and proposed Regulations and Test Procedures for the Tier 4 Off-Road Diesel Engine Rulemaking will be available after 5p.m. PST, Friday, October 22, 2004.

Posted October 1, 2004:
	The Draft Proposed Regulations for the upcoming Tier 4 Off-Road Diesel Engine Rulemaking are now available. The submittal of comments regarding this draft is not necessary. ARB intends to release the official proposal for a 45-day public comment period on October 22, 2004.

Diesel Activities: Mobile Vehicles and Equipment

Diesel Activities - Certifications & Verifications

Off-Road Mobile Sources Emission Reduction Program