How is China V emission standard represented by letters?

[OManuel]

China V emission standard is represented by the letter V, with its full name being the National Fifth Stage Emission Standard for Motor Vehicle Pollutants, equivalent to the Euro 5 emission standard currently implemented in Europe. Compared to China IV standard, China V reduces nitrogen oxide emissions by 25% for light-duty vehicles and 43% for heavy-duty vehicles. Methods to check a vehicle's emission standard: 1. Check the motor vehicle conformity certificate; 2. Look for the vehicle's accompanying list; 3. Visit the Motor Vehicle Exhaust Pollution Supervision and Management website; 4. Inspect the back of the environmental protection label on the vehicle's front windshield; 5. Bring the vehicle registration form to the DMV for inquiry.