On July 26, 2007, the California Air Resources Board (CARB) adopted the Regulation for In-Use Off-Road Diesel-Fueled Fleets (Off-Road Diesel Regulation) to reduce diesel particulate matter (PM) and oxides of nitrogen (NOx) emissions from in-use (existing) off-road heavy-duty diesel vehicles in California. These vehicles are used in construction, mining, industrial operations and other industries.
The Regulation applies to:
- Vehicles with off-road engines of 25 hp or greater.
- Workover rigs.
- 2-engine cranes.
- 2-engine water well drilling rigs
- 2-engine vehicles with auxiliary engines of greater than or equal to 50bhp that
- Are not subject to the Public Agencies & Utilities (PAU) fleet rule
- Are not sweepers subject to Truck & Bus rule
- Do not contain a Tier 0 auxiliary engine
The Regulation does not apply to:
- Commercial marine vessels and marine engines
- Recreational off-highway vehicles
- Combat and tactical support equipment
- Stationary equipment
- Personal use motor homes or recreational vehicles
- Portable engines, except auxiliary engines on 2-engine vehicles
- Equipment used exclusively for agricultural operations
- Implements of husbandry
- Certain 2-engine vehicles
- 2-engine street sweepers subject to Truck & Bus rule
- Equipment subject to the mobile Cargo Handling
- Equipment (CHE) rule
- Equipment owned and operated for personal, non-commercial, and non-governmental use
- Vehicles awaiting sale (i.e., dealers)