What do China 5 and China 6 mean?

[VanLyla]

China 5 and China 6 refer to the national vehicle emission standards stipulated by the government. Specifically, China 5 stands for the National Fifth Stage Emission Standard for Motor Vehicles, while China 6 represents the National Sixth Stage Emission Standard for Motor Vehicles. Vehicle emission standards regulate the permissible levels of harmful gases emitted from vehicle exhaust, including CO (carbon monoxide), HC plus NOx (hydrocarbons and nitrogen oxides), and PM (particulate matter, soot). To curb the generation of these harmful gases and encourage automobile manufacturers to improve their products to reduce emissions at the source, both Europe and the United States have established relevant vehicle emission standards. Among these, the European standards serve as the reference for China's vehicle emission standards.