What is the reason for the haze weather?

There are several reasons for the formation of haze weather:

One is the main factor when the atmospheric pressure is low and the air does not flow. Because the air does not flow, tiny particles in the air gather and float in the air; Second, the ground is dusty and the air humidity is low, and people and traffic on the ground stir up dust; Third, automobile exhaust is the main pollutant emission. In recent years, there are more and more cars in cities, and automobile exhaust is a factor of smog. The fourth is the secondary pollution produced by the factory; Fifth, CO2 and other pollutants emitted by heating in winter.