Why is the weather in Xi 'an so bad?

1, meteorological reasons. At the end of the year and the beginning of the year, there are often extreme unfavorable meteorological conditions such as high humidity, static stability and inversion temperature, which lead to the inability of pollutants to spread and the gradual aggravation of siltation.

2. Coal burning and regional pollution. There are also many large industrial enterprises, thermal power plants and central heating stations in Guanzhong Basin. In addition, the pollution emissions from the burning of biomass such as loose coal and straw in rural areas are still launching the "pollution last bus" every day.

3. The air pollution in Weinan and Xianyang in the east and west of Xi 'an is seriously polluted, and the air quality in Xi 'an caught in the middle will not be spared.

Xi' an topography

Xi 'an Plain belongs to warm temperate zone and semi-humid continental monsoon climate, with four distinct seasons: cold, warm, dry and wet. Winter is cold, windy, foggy and less rainy and snowy; Spring is warm, dry, windy and the climate is changeable; Summer is hot and rainy, drought is prominent, and there are many thunderstorms and strong winds; Autumn is cool, the temperature drops rapidly, and the autumn rain is obvious.

Xi 'an has a dense river network with 54 rivers. Among them, Weihe River, Jinghe River and Shichuan River are transit rivers, and the rest rivers all originate from Qinling Mountains or the hills of Li Dongnan, and most of them flow through Weihe Plain from south to north and flow into Weihe River. The area of the Yellow River basin accounts for 98.46% of the total area of the city. The basin area of rivers in Xi 'an varies greatly.

The above content is quoted from Baidu Encyclopedia -Xi 'an.