What is the difference between emission standards 6a and 6b?

[Molly]

The difference between emission standards 6a and 6b is evident when comparing the emission data of China 6a and China 6b. Below is an introduction to emission standards 6a and 6b: 1. Compared to China 6a, China 6b imposes stricter requirements on the emissions of carbon monoxide, non-methane hydrocarbons, nitrogen oxides, and PM fine particulate matter. The data shows a significant increase in strictness, with China 6a essentially serving as a transitional phase to China 6b. 2. Most regions in China officially implemented the China 6 standard on July 1, 2019. The deadline for registering China 5 vehicles in various regions is the same as the implementation date of the local China 6 standard. 3. The original national timetable for the implementation of the first phase of the China 6 emission standard (China 6a) was set for July 1, 2020. However, most regions in China advanced the implementation to July 1, 2019. For regions that did not implement the China 6 emission standard on July 1, there is a possibility of early implementation in the future.