What is the difference between National IV and National V?
2 Answers
The difference between National IV and National V lies in the upper limit of sulfur content: 1. The upper limit of sulfur content in National IV standard gasoline is 10mg. 2. The upper limit of sulfur content in National V standard gasoline is 50mg. Additional information: 1. National V has stricter control over nitrogen oxides than National IV, with National V setting the emission limit at 25%. 2. The National IV 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 better catalytic converter active layers, secondary air injection, and exhaust gas recirculation systems with cooling devices helps reduce these emissions.
I've been observing automotive emission standards for years, and the biggest difference between China V and China IV lies in significantly stricter emission limits. For instance, China V nearly halved nitrogen oxide limits and mandated particulate filters to trap soot, unlike China IV which relied solely on basic catalytic converters. China V also enhanced OBD systems for real-time emission monitoring, triggering alerts for immediate repairs when issues arise. Testing methodology shifted from outdated NEDC cycles to more realistic WLTP simulations combining urban and highway driving. This means China V vehicles emit cleaner exhaust during daily operation, reducing smog formation. Although production costs rose 5-10% and maintenance requires periodic filter replacements, overall vehicle prices remain stable with registration priority in cities like Shanghai and Beijing. Long-term, this promotes green transportation development while slightly improving engine efficiency. Technologically, China V represents a major leap forward, laying groundwork for China VI upgrades. This evolution reflects strengthened environmental awareness in the automotive sector - from policy-driven initiatives to tangible vehicle implementations, delivering measurable urban air quality improvements.
