When was the China 5 emission standard implemented?

[LaHenry]

The nationwide comprehensive implementation of the China 5 emission standard began on July 1, 2017. The emission control level of China 5 standard is equivalent to the Euro 5 emission standard currently implemented in Europe. Compared with the China 4 standard, the China 5 standard reduces nitrogen oxide emissions by 25% for light-duty vehicles and 43% for heavy-duty vehicles. Here is a brief introduction about the China 5 standard: The fifth-stage national standard for motor vehicle pollutant emissions, referred to as the 'China 5 standard', has an emission control level equivalent to the Euro 5 standard. From China 1 to China 4, each upgrade in the standard reduces vehicle pollution by 30% to 50%.