Which season in North China is most prone to haze weather?

Haze weather has obvious seasonality, mainly in autumn and winter, because of low temperature and weak ground pressure field. The wind force near the ground is small, if there is no cold air activity, the atmospheric stratification will be relatively stable, and there is an inversion layer near the ground, which is not conducive to the dilution and diffusion of pollutants. At this time, if the humidity is high, it is easy to form haze weather.

Climatic characteristics:

The climate in northern China is mainly temperate monsoon climate. Summer is hot and rainy, and winter is cold and dry. The annual average temperature is about 8 ~ 65438 03℃. The annual precipitation is about 400 ~1000 mm. The precipitation in Inner Mongolia Autonomous Region is less than 400 mm, which belongs to semi-arid area.

From Dandong, Fuxin, Zhangwu, Zhangbei, Youyu, Yulin, Dingbian, Zhongning to Wushaoling, most of the area south of this line belongs to the warm temperate zone, where crops are harvested three times a year and loess is widely distributed.