What are the causes of haze weather?

there are several reasons for the smog weather.

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

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

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

4. Secondary pollution produced by factories.

5. CO2 and other pollutants emitted by heating in winter.