What are the symbols from National Standard 1 to National Standard 6?

[McKiara]

The symbol representations from National Standard 1 to National Standard 6 are I, II, III, IV, V, and VI respectively, following international standards by adopting Roman numerals. Methods to check a vehicle's emission standard are as follows: 1. Vehicle environmental protection label: Check the vehicle's environmental protection label, where the 'Emission Standard' section will indicate the national standard level. However, environmental protection labels have now been abolished, meaning current vehicles no longer carry them. 2. Factory certificate: For new vehicles, the information can be found on the vehicle's factory certificate or conformity certificate. 3. Website inquiry: Visit the public inquiry platform of the Motor Vehicle Environmental Protection Website to verify. You will need to input the vehicle's VIN (Vehicle Identification Number) and the last 6 digits of the engine number.