How is China 6 standard represented?

[VonLucia]

China 6 should be represented as China VI. Here is some introduction to the China 6 standard: 1. China 6 is the sixth-stage national standard for pollutant emissions from motor vehicles. 2. The sixth-stage national standard for pollutant emissions from motor vehicles is established to prevent environmental pollution caused by exhaust emissions from compression-ignition and gas-fueled spark-ignition engine vehicles, protect the ecological environment, and safeguard human health. Additional content: China's motor vehicle pollutant emission standards have been gradually upgraded. In 2001, the first-stage national motor vehicle emission standard was implemented. After 15 years of development, the fourth-stage emission standard is currently implemented nationwide, while key regions have adopted the fifth-stage emission standard. The pollutant emissions per vehicle have been reduced by over 90%, effectively promoting technological upgrades in the automotive industry.