This section presents truck emission-related information about heavy-duty highway engines, such as those used in trucks and buses. Our focus is on diesel engines, but requirements may also apply for gasoline-fueled and other spark-ignition engines. The requirements apply to engines installed in all vehicles with Gross Vehicle Weight Rating above 14,000 pounds, and to some engines installed in vehicles with Gross Vehicle Weight Rating between 8,500 and 14,000 pounds.
CARB Requirements Truck & Bus Rule
Forms & Applications
Our emissions requirements section covers the following topics: