Why is the air quality in Zhengzhou, Xi, Tianjin, Taiyuan and Shijiazhuang poor?

First, the terrain. Xi 'an is located in Guanzhong Plain, especially the Qinling Mountains, the lung of South China, with a relatively high altitude of more than 2000 meters, while Xi 'an is about 400 meters above sea level. Northwest wind prevails in Xi 'an in autumn and winter, and there are mountains in the south, so it is difficult for the airflow to blow out pollutants.

Second, industrial planning. There are many chemical plants in northwest Anxi, especially in Xianyang Sanyuan. As we all know, the chemical plant is seriously polluted, but the chemical plant is located in the upwind direction of Xi 'an, upstream of Weihe River, and the northwest wind just brings pollution into Xi 'an.

Third, urban construction. Xi has developed rapidly in recent years, but there are not many physical industries, especially the team has paid special attention to real estate recently, so you can see the demolition sites all over the street, and there are naturally many building pollutions, especially the bumblebees pulling muck trucks all the way.

Fourth, the population is over-concentrated, urban planning is backward, pollution is concentrated, there are many vehicles, and thermal power plants are close to cities.