What is the method for identifying the national emission standard of a vehicle?

[MacZachary]

Vehicle identification methods for national emission standards are: 1. Check the environmental protection label sticker on the vehicle; 2. Refer to the vehicle conformity certificate - Roman numeral 1 indicates National Standard I, 2 indicates National Standard II, 3 indicates National Standard III, 4 indicates National Standard IV, 5 indicates National Standard V, and 6 indicates National Standard VI; 3. Use the vehicle registration certificate to inquire at the local vehicle management office. Taking National Standard VI as an example, its National Standard VIa regulations specify: 1. Gasoline vehicles must not emit more than 700mg of carbon monoxide per kilometer driven; 2. Gasoline vehicles must not emit more than 68mg of non-methane hydrocarbons per kilometer driven; 3. Gasoline vehicles must not emit more than 60mg of nitrogen oxides per kilometer driven; 4. Gasoline vehicles must not emit more than 4.5mg of PM (particulate matter) per kilometer driven.