Traditional Culture Encyclopedia - Weather inquiry - What are the man-made reasons for the persistent smog weather in Ningbo?

What are the man-made reasons for the persistent smog weather in Ningbo?

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

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

3. Secondary pollution produced by factories. 5. CO2 and other pollutants emitted by heating in winter.