What is the difference between National 5 and National 6 emission standards?
4 Answers
The differences between National 5 and National 6 emission standards are: 1. Different emission levels: The carbon monoxide emission limit for National 5 is 1000mg per kilometer; for National 6 it is 700mg per kilometer. 2. Different restrictions: The sulfur content limit for National 5 is 10ppm, and the manganese content limit is 2mg per liter; for National 6, the sulfur content limit is 5ppm, and the manganese content limit is 1mg per liter. 3. Different forms: During the National 5 phase, diesel and gasoline vehicles had different emission standards; National 6 adopts a fuel-neutral principle, meaning the emission limits are the same regardless of the fuel type used.
The difference between the China V and China VI emission standards strikes me as quite significant. Technically speaking, China VI imposes stricter limits on pollutants. For instance, nitrogen oxide emissions under China VI are about 30% lower than under China V, and particulate matter is also significantly reduced. This is because China VI incorporates a real-time onboard diagnostic system that can detect exhaust abnormalities while driving. Additionally, engine designs have been modified, with more efficient fuel injection and catalytic converters, and the use of low-sulfur fuel is required to prevent system clogging. In the long run, China VI vehicles are more environmentally friendly, but the increased production costs may lead to slightly higher car prices. During maintenance, it's essential to regularly check the diagnostic interface; otherwise, it's easy for the malfunction indicator light to come on, affecting driving safety. I've also noticed that this standard has driven many automakers to innovate technologically, contributing significantly to improved air quality.
When buying a China VI vehicle, I noticed several key changes. The price is usually slightly higher than China V, but it's more popular in the used car market because many big cities restrict China V vehicles. The driving experience feels similar, but the fuel requirements are stricter—you must use low-sulfur gasoline to avoid damaging the exhaust treatment system. Policy-wise, the differences are significant: China VI was implemented in phases starting in 2019, and now it's fully China VI b, with stricter emission tests than China V to ensure compliance. Long-term fuel costs may not necessarily be lower, but the environmental benefits are much greater, helping reduce urban smog. I think choosing a China VI vehicle is still the priority for hassle-free future mobility.
The China VI standard is a significant advancement in China's environmental protection efforts, reducing more harmful emissions such as carbon monoxide and hydrocarbons compared to China V. This difference has driven automakers to upgrade their technologies, making engines cleaner and more efficient. Consumers benefit from fresher air, and I believe this policy-driven promotion of green transportation is a positive development.
