Off-Road Mobile Sources

The California Clean Air Act (CCAA) mandates the Air Resources Board (ARB) to achieve the maximum degree of emission reductions from all on- and off-road mobile sources in order to attain the state ambient air quality standards. Off-road mobile sources include:

	Small Spark-Ignition Off-Road Engines and Equipment Less Than 25 Horsepower (Including Lawn and Garden Equipment, and Small Industrial Equipment)
	Off-Road Recreational Vehicles (Including Motorcycles and All-Terrain Vehicles)
	Off-Road Compression Ignition (Diesel) Engines and Equipment (This is for new equipment. If you are looking for the in-use (existing) diesel equipment please go here .)
	Off-Road Large Spark Ignition (Gasoline and LPG) Engines and Equipment 25 Horsepower and Greater (Including Industrial Equipment, Forklifts, and Portable Generators) See the newly designed website!
	Airport Ground Support Equipment
	Cargo Handling Equipment (Diesel) at Ports and Intermodal Rail Yards
	Locomotives / Railyards
	Commercial Marine Vessels
	Commercial Harbor Craft
	Recreational Marine (Including Personal Water Craft, Ski Boats, Inboards, and Outboards)

Exhaust emission standards have been adopted by ARB for off-road engines included in the above categories.

Exhaust Emission Standards for Off-Road Engines (Updated October 11, 2007)

Additional ARB Programs for Off-Road Engines and Equipment

Off-Road Equipment (In-Use) Control Measure Proposed control measure to reduce diesel particulate matter (PM) emissions from in-use (existing) off-road mobile equipment (used in construction, mining, and industrial operations).
Off-Road Engine Aftermarket Parts
ARB Portable Equipment Program
Emissions Inventory
Mobile Source Certification Programs
Off-Road Mobile Source Status Review

The 1990 amendments to the federal Clean Air Act preempt California control of emissions from new farm and construction equipment under 175 horsepower. Please view a description of preempt equipment. For may also be interested in more information regarding the federal non-road engine emissions control program.

Mobile Source Program
Diesel Activities - Certifications & Verifications