Using relevant geographical knowledge to analyze the causes of severe haze weather in winter in Beijing

The northwest and east of Beijing are surrounded by mountains on three sides. The west and southwest are the northeast remnants of Taihang Mountain, mainly Mentougou District and Fangshan District. In the north and northeast, the western branch of the Yanshan Mountains is Yanshan (Yanqing, Pinggu, Huairou and Miyun), and the south and southeast are North China Plain (Daxing and Tongzhou). The so-called three sides are surrounded by mountains, or exactly two and a half sides.

The main factor when the atmospheric pressure is low and the air does not flow. Because the air does not flow, the tiny particles in the air gather together and float in the air.

2.

The ground is dusty and the air humidity is low. People and vehicles on the ground stir up dust.

3.

Automobile exhaust is the main pollutant emission. In recent years, there are more and more cars in cities, and automobile exhaust emission is a factor of haze weather.

4.

Secondary pollution produced by factories.

5.

CO2 and other pollutants emitted by heating in winter.

Hazards: including inhalable particles (PM 10) and particles that can enter the lungs (PM2.5). In industrial production, burning sulfur oxides, nitrogen oxides and coal will release a lot of particulate matter. These particles can stay in the air for a long time after being discharged into the air, and are easily inhaled into the lungs by the breathing behavior of land and air creatures. When there are too many particles accumulated in the lungs, it will affect the health of the body.