What does the National IV standard mean?

[LaAubree]

National IV standard refers to the fourth-phase national motor vehicle emission standard in China. The methods to check a vehicle's emission standard are: 1. Check the motor vehicle conformity certificate. Vehicles come with a conformity certificate upon leaving the factory, which clearly states the emission standard; 2. Refer to the vehicle's packing list, where the emission standard can be found in the vehicle information section; 3. Examine the conformity of production certificate, which includes exhaust emissions and indicates the corresponding emission standard; 4. Query on the Motor Vehicle Environmental Protection Website by entering the vehicle's VIN code and the last 6 digits of the engine number in the public query platform located at the bottom of the homepage; 5. Inspect the vehicle's environmental protection label. The back of the environmental protection label on the vehicle's front windshield clearly indicates the emission standard.