What are the main factors causing extreme weather such as haze, heavy rain, and El Niño?

The formation is mainly the result of the synergistic effect of a large number of particles suspended in the air and meteorological conditions. There are three causes:

——The phenomenon of static wind increases in the horizontal direction. In cities Buildings are getting taller and taller, and the blocking and friction effects significantly weaken the wind flow through urban areas. The phenomenon of quiet wind increases, which is not conducive to the diffusion and dilution of suspended particles in the atmosphere, and is easy to accumulate around urban areas and suburbs;

— —Temperature inversion occurs in the vertical direction. The inversion layer is like a pot lid covering the city. This inversion phenomenon in which the temperature at high altitude is higher than that at low altitude restricts the vertical movement of air at low altitude in the atmosphere, making it difficult for suspended particles in the air to Drifting to high altitudes and being blocked at low altitudes and near the ground.

——The increase in suspended particulate matter in the air. With the growth of urban population, industrial development, and the surge of motor vehicles, pollutant emissions and suspended A large number of objects increased, which directly led to the reduction of visibility.