The Clean Truck Check program applies to almost all non-gasoline trucks, buses, public vehicles, motorcoaches, transit, shuttle and school buses, hybrid vehicles, commercial vehicles, personal vehicles, California-registered motorhomes, single vehicle fleets, and vehicles registered outside of California (excluding motorhomes) with a gross vehicle weight rating (GVWR) over 14,000 lbs. that operate in California on public roads and highways. These vehicle owners must report, pay annual compliance fees, and undergo emissions compliance testing to comply with Clean Truck Check.
The Clean Truck Check Program does not apply to:
- Zero-emission vehicles
- Military tactical vehicles (title 13, CCR, section 1905)
- Emergency vehicles (California Vehicle Code section 165 or California Health and Safety Code section 1797.84)
- Historical vehicles (authorized by California Vehicle Code section 5004)
- New vehicles with engines certified to the most stringent optional NOx standard (less than or equal to 0.01 g/bhp-hr) during the first four years of Clean Truck Check implementation (2023-2027)
- Motorhomes registered outside of California
- Vehicles operating under an experimental permit authorized by California Health and Safety Code section 4301
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