What is the difference between National V and National VI?

2 Answers
StOmar
07/29/25 2:18am
The differences between National V and National VI are: 1. Different nitrogen oxide emission standards: National V vehicles have a nitrogen oxide emission standard of 0.18 grams per kilometer; National VI vehicles have a nitrogen oxide emission standard of 0.16 grams per kilometer. 2. Different particulate matter concentration emission standards: National V vehicles have a particulate matter concentration emission standard of 0.0045 grams per kilometer; National VI vehicles have a particulate matter concentration emission standard of 0.022 grams per kilometer. 3. Different non-methane hydrocarbon emission standards: National V vehicles have a non-methane hydrocarbon emission standard of 0.23 grams per kilometer; National VI vehicles have a non-methane hydrocarbon emission standard of 0.18 grams per kilometer.
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Leah
08/12/25 6:17am
I've researched this, and the main difference between China 5 and China 6 is the significantly stricter emission standards. China 6 has drastically lowered the limits for pollutants like nitrogen oxides and particulate matter, forcing automakers to upgrade their technologies. Nowadays, new vehicles mostly comply with the China 6b phase, and the testing methods have shifted to the more realistic Worldwide Harmonized Light Vehicles Test Procedure (WLTP), unlike the simpler lab-based tests before. In practical terms, China 6-compliant vehicles may require more sensors and particulate filters, making maintenance slightly more complicated but more environmentally friendly. Personally, I think this upgrade helps reduce urban smog and benefits public health in the long run, but during the transition period, car owners need to pay attention to local traffic restrictions to avoid limitations on China 5 vehicles. Overall, this is an inevitable trend of technological progress, driving innovation in the automotive industry while improving air quality.
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