What do China 4, China 5, and China 6 mean for vehicles?

[Sousa]

China 4, China 5, and China 6 all refer to vehicle emission standards. Here are the specific details: China 4 Emission Standard: Issued by the Ministry of Environmental Protection on April 15, 2005. Gasoline vehicles began implementing the standard from July 1, 2010. Diesel vehicles implemented the standard by vehicle type and region, with the final nationwide implementation for diesel vehicles completed by July 2013. China 5 Emission Standard: Announced by the Ministry of Environmental Protection on September 17, 2013. From January 1, 2018, all motor vehicles nationwide fully implemented the China 5 emission standard. Currently, Beijing, Shanghai, and Guangzhou have already taken the lead in implementing the China 5 standard for gasoline vehicles. China 6 Emission Standard: Starting from July 2021, the China 6 emission standard for heavy-duty diesel vehicles will be fully implemented, marking the comprehensive entry of domestic vehicle standards into the China 6 era, essentially achieving alignment with developed countries in Europe and America.