What does the National VI environmental standard mean?

[LaAmy]

National VI environmental standard refers to the National 4 emission standard, which regulates the content of harmful gases emitted from vehicle exhaust, such as carbon monoxide, hydrocarbons, nitrogen oxides, particulate matter, and soot. To curb the generation of harmful vehicle emissions and encourage manufacturers to improve their product technologies, many countries have established relevant automotive environmental emission standards. The widely adopted European standard is also a reference for China's vehicle emission standards, and based on this, China has introduced national standards that are more suitable for its own conditions. The European emission standards are implemented through the emission regulations of the United Nations Economic Commission for Europe (UNECE) and the emission directives of the European Community (EC), which is now the European Union (EU). The emission regulations are voluntarily recognized by the participating countries of the UNECE, while the emission directives are mandatory for the participating countries of the EC or EU.