What's the difference between floating dust and dust?

Floating dust appears when there is no wind or wind before and after cold air passes through the boundary, and it is spread by distant dust through high-altitude airflow. Or it is caused by dust floating in the air after sand blowing or sandstorm weather. The visual distance is less than 10km, and the vertical visibility is also poor.

Sand blowing is due to blowing up local or nearby dust, which significantly reduces visibility. The visible distance is generally 1- 10km. The sky is cloudy and windy. In northern spring and summer, cold air passes through the mirror or the air is unstable.

The cause of sandstorm is similar to that of sand blowing, but the visibility is different.

The difference between floating dust and sand blowing is that sand blowing is formed by local or nearby dust being blown up, while floating dust mostly comes from far away (or it may be formed by dust still floating in the air after sand blowing); More importantly, when blowing sand, the wind is strong, the air is unstable, and the conditions for floating dust are little or no wind. The main difference between sandstorm and sand blowing is low visibility.