Why are there many pollutants in North China in winter?

1. In winter, the weather is cold, and most parts of China are controlled by Mongolian Siberian high, and downward flow is dominant. In winter, inversion is easy to occur and pollutants are not easy to spread.

At present, China's energy structure is still dominated by coal, which causes great pollution.

3. In winter, the north of China is cold, burning a lot of energy, such as coal, to keep warm. Most of the coal has not been desulfurized and gasified before use, and the combustion is not sufficient, and more smoke and sulfur dioxide waste gas are emitted, which aggravates the pollution.