Why was it sunny yesterday and foggy today?

1, the natural factors of haze weather are: the atmospheric pressure is low and the air does not flow, which makes the tiny particles in the air gather and float in the air. The ground is dusty and the air humidity is low. People and traffic on the ground stir up the dust.

2. The human factors of haze weather are: mainly man-made environmental pollution. As we all know, the air pollution caused by traditional gasoline vehicles is quite serious, and the air pollution caused by exhaust emissions forms haze weather, which now accounts for more than half of the total pollution sources.

In northern China, coal is the main heating mode in winter, and the main reason for air quality "exceeding the standard" (being polluted) is that coal emits a lot of smoke (solids) and harmful gases (gases) into the atmosphere, so pollution sources must be strictly controlled and eliminated.

Some regions blindly pursue the improvement of GDP, bringing in a large number of foreign enterprises with serious pollution, making China a "world factory", leaving a lot of pollutants for themselves, which is also the reason for the smog. It must be worse when there is no wind, and particles gather in the air. The wind blew away. The smog is serious. Don't forget to wear a mask when you go out. Tmall's Puweixin is a good choice, imported from the United States.