What is the difference between National IV and National V vehicle emission standards?

[DerekMarie]

Here are the specific differences between National IV and National V standards: 1. Sulfur content: The sulfur content limit for National IV standard gasoline is 10mg; while for National V standard gasoline it's 50mg. 2. Emission limits: National V has stricter control on nitrogen oxides compared to National IV, with National V setting the emission limit at 25%. The National IV emission standard is China's fourth-phase motor vehicle pollutant emission standard, with main vehicle pollutants being HC, NOx, CO, PM, etc. Compared to National IV, the National V standard can reduce nitrogen oxide emissions by 25% for light-duty vehicles and 43% for heavy-duty vehicles.