Why didn't the weather in China pass the ozone 198 standard?

1. Control measures: The Chinese government, environmental protection departments and relevant institutions have taken a series of control measures, such as strict implementation of emission standards, industrial pollution control and vehicle exhaust control, which have played a certain role in reducing ozone concentration.

2. Geographical environment: The ozone concentration will be different in different geographical areas. The mountainous areas or marine areas around the city are located in the plain area, and the ozone concentration will be low, and the data shows that it does not exceed the standard.