This standard specifies the limits and measurements of exhaust smoke emissions for compression ignition engines and vehicles equipped with compression ignition engines.

This standard applies to exhaust emissions in compression ignition engines, including engine type approval and inspection of conformity of production. The emission of smoke emissions from compression ignition engines includes new car type approval and inspection of conformity of production, and test of newly produced vehicles and vehicles in use.

This standard is also applicable to vehicles in use manufactured in accordance with the GB14761.6-93 Standard for Free Acceleration Smoke Emission of Diesel Vehicles. This standard is also applicable to light-duty vehicles equipped with compression ignition engine with pollutant emissions consistent with GB18352. This standard does not apply to low speed truck and tricycle.