In which year did China introduce the China 5 emission standard vehicles?

[StJasmine]

China introduced the China 5 emission standard vehicles on July 1, 2017. Here are the relevant details: 1. China 5 standard: After the implementation of the China 5 standard, the restrictions on vehicle emissions such as nitrogen oxides, hydrocarbons, carbon monoxide, and particulate matter became more stringent. Compared to the China 4 emission standard, the nitrogen oxide emissions can be reduced by 25%. The China 5 emission standard also added restrictions on non-methane hydrocarbons and PM emissions, reducing the pollution of vehicle exhaust to the atmospheric environment. 2. China 6 standard: At present, China has entered the China 6 emission standard. After the official implementation of the China 6 standard, it will become the strictest vehicle emission standard in the world.