Is there smog in Chengdu only in winter?

Due to the serious air pollution in most cities in China, smog weather occurs every autumn and winter.

What is the cause of haze weather?

Fog refers to the weather phenomenon that the visibility is lower than 1 km due to the condensation of suspended water vapor in the atmosphere. The formation of smog is mainly the result of the interaction between a large number of suspended particles in the air and meteorological conditions. There are three reasons for the smog weather: 1, and the phenomenon of increasing static wind in the horizontal direction. 2. There is an inversion in the vertical direction. 3. The increase of suspended particles in the air.