What are the symbols for China 4, China 5, and China 6?

[MacVera]

The symbols for China 4, China 5, and China 6 are China IV, China V, and China VI respectively. Here is some additional information: 1. Some cities or regions have gradually started implementing the China 6 standard, which is known as the National Sixth Stage Vehicle Emission Standard and is considered the strictest emission standard in history. 2. The China 6a standard is used as a transitional period from China 5 to China 6. 3. With the increasing prominence of environmental pollution issues, countries around the world have introduced strict emission standards to regulate automobile manufacturers. With these strict standards, manufacturers can produce more environmentally friendly vehicles. 4. Strict emission standards can help phase out older vehicles that do not meet emission requirements, playing a positive role in protecting the Earth's environment.