Why is there smog weather in Beijing?

There are three main reasons for this heavy pollution.

First, coal, motor vehicles, industry, dust and other pollution sources are large, which is the root cause of this serious air pollution. Especially since 20 12 and 12, the whole north China has been in extremely low temperature weather, and the emission of coal-fired heating has also increased correspondingly due to low temperature, which has a great impact on this aspect.

Second, the diffusion conditions are unfavorable. The recent extremely unfavorable pollution diffusion conditions are the direct cause of this pollution process. 10 ~ 13, the ground in Beijing is closed by low air pressure, and the ground wind speed decreases and the humidity increases, which gradually forms the intake inversion and the fog extreme weather diffusion, and the continuous accumulation causes this pollution process;

Third, the superposition of regional pollution and local pollution contributions, regional pollution of PM2.5 and pollution transmission in related areas are also important factors for the formation of this heavy pollution.