CARB Compliance & Testing

For fleets operating commercial vehicles in California, a strict environmental regulation is active and preparing to expand. The California Air Resources Board Clean Truck Check, widely known as CARB CTC, requires periodic emissions checks for nearly all medium-duty and heavy-duty vehicles operating on state roads. Testing is already mandatory twice

Commercial fleets operating in California must comply with state environmental mandates to avoid business interruptions. Non-gasoline vehicles over 14,000 pounds — including out-of-state trucks — must hold an active California Air Resources Board (CARB) Clean Truck Check certificate to run legally on state roads. Operating without a valid certificate triggers

California’s vehicle emissions standards, set by the California Air Resources Board (CARB), are currently the strictest in the country. Under CARB regulations, clean truck check testing is now mandatory for nearly all heavy-duty and many medium-duty vehicles. In 2026, most vehicles over 14,000 pounds must complete emissions testing twice a

The California Air Resources Board (CARB) is the state agency responsible for protecting air quality in California. Under the CARB Clean Truck Check program, most heavy-duty trucks must complete periodic emissions testing twice a year in 2026. However, for a large number of vehicles, the testing frequency is increasing to