What is the Difference Between National 4 and National 5?
2 Answers
National 4 and National 5 differ in the upper limit of sulfur content: 1. The upper limit of sulfur content in National 4 standard gasoline is 10mg; 2. The upper limit of sulfur content in National 5 standard gasoline is 50mg. Additional information: 1. National 5 has stricter control over nitrogen oxides compared to National 4, with National 5 setting the emission limit at 25%. 2. The National 4 emission standard is the fourth stage of China's motor vehicle pollutant emission standards. The main pollutants emitted by vehicles include HC, NOx, CO, PM, etc. The application of technologies such as improved catalytic converter active layers, secondary air injection, and exhaust gas recirculation systems with cooling devices helps reduce these emissions.
I’ve always been quite concerned about environmental issues, so the difference between China 4 and China 5 standards is quite important to me. The China 5 emission standards are more stringent, with significantly lower limits for pollutants like nitrogen oxides and particulate matter, which helps improve air quality and alleviate urban smog problems. In comparison, the China 4 standards are relatively lenient, putting more pressure on the environment. Many cities have already started restricting China 4 vehicles, such as banning them from urban areas or making registration difficult, while China 5 vehicles enjoy full freedom. Technically speaking, China 5 vehicles may have slightly lower fuel consumption due to more efficient systems, and although the initial cost is a bit higher, they hold their value better in the long run. In short, the differences mainly lie in environmental performance and policy adaptability. I recommend prioritizing China 5 vehicles to support green mobility and avoid future hassles. This is a crucial step toward cleaner transportation.
