Off-Road Mobile Sources

This page last reviewed June 23, 2015.

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:

child mowing lawn Small Off-Road Engines and Equipment Less Than 25 Horsepower (Including Lawn and Garden Equipment, and Small Industrial Equipment)
children riding ATV's Off-Highway Recreational Vehicles (Including Motorcycles and All-Terrain Vehicles)
backhoe 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 .)
forklift 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 Tug Airport Ground Support Equipment
Forklift loading Cargo Cargo Handling Equipment (Diesel) at Ports and Intermodal Rail Yards
Locomotive Locomotives / Railyards
Commercial Marine Vessel Commercial Marine Vessels
Commercial fishing boat Commercial Harbor Craft
boat in water Recreational Marine (Including Personal Water Craft, Ski Boats, Inboards, and Outboards)

Emission standards have been adopted by ARB for off-road engines included in the above categories.  (Updated March 30, 2010.)

Additional ARB Programs for Off-Road Engines and Equipment

For 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 further information, you may also be interested in visiting the federal non-road engine emissions control program.