What do China 5 and China 6 mean?
2 Answers
China 5 and China 6 are automobile exhaust emission standards, which regulate the content of harmful gases such as carbon monoxide, PM, and soot emitted from vehicle exhaust. The higher the number, the later the standard was issued, and the stricter the energy-saving and emission reduction requirements for vehicles. The changes from China 5 to China 6 include improvements in intake and exhaust efficiency, exhaust gas recirculation efficiency, etc., with the aim of reducing the levels of harmful gases. The China 6 emission standard is an upgraded version of the current China 5 standard, imposing more stringent limits on the emission of carbon monoxide, total hydrocarbons, non-methane hydrocarbons, nitrogen oxides, and particulate matter mass compared to the China 5 standard. Additionally, it introduces new regulations on the number of particulate matter emissions.
Recently, I've been quite interested in vehicle emissions. Talking about China V and China VI, these are actually the standard levels set by China for new vehicle exhaust pollution. China V is the abbreviation for the fifth stage, implemented since 2017, which limits the emissions of harmful substances like nitrogen oxides and carbon monoxide, requiring vehicles to be equipped with basic purifiers. China VI is the sixth stage, divided into two versions, a and b, with b being stricter. For example, it reduces the limit for particulate matter by almost half, and many major cities have enforced it after 2020. This means China VI vehicles must use more advanced exhaust treatment technologies, possibly adding something like a particulate filter, resulting in stronger purification effects and naturally better air quality. However, at the same time, vehicle manufacturing costs have risen, and we need to choose China VI-compliant new cars to avoid traffic restrictions. In the long run, environmental protection is indeed important, but I think the government should provide more subsidies to reduce the burden on the public, especially in cities with heavy smog.
