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1. California's Heavy Duty Inspection Program
The California Air Resources Board (ARB) is testing heavy-duty trucks and buses for excessive smoke and tampering. Any heavy-duty vehicle traveling in California, including vehicles registered in other states and foreign countries, may be tested.

California ProgramCalifornia Program
[.pdf, 243.4Kb]

See Also
In-use trucks - I and M programs
General topics
Cleaner vehicles - Buses
Cleaner vehicles - Trucks

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