Why is the smog in Shanghai serious?

The reason for the serious smog in Shanghai is that the atmospheric pressure is low. Because the air does not flow, the tiny particles in the air gather together and float in the air. Moreover, the ground is dusty and the air humidity is low. People and vehicles on the ground stir up dust. Haze is a combination of fog and haze. Smog is very common in cities. In many areas of China, fog and haze are combined as disastrous weather phenomena for early warning and forecasting, which are collectively called "haze weather".

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