What are the five grades of dusty weather?

Dust weather is divided into five grades: floating dust, sand blowing, sandstorm, strong sandstorm and extra-strong sandstorm.

1, floating dust

Floating dust refers to the weather phenomenon that the dust with horizontal visibility less than 10 km floats in the air for 4 seconds under the condition of no wind or the average wind speed is less than 3.0 meters.

Step 2 blow sand

Sand blowing refers to the weather phenomenon that the wind blows up the dust on the ground, making the air quite turbid and the horizontal visibility is within the range of 1 km- 10 km.

Step 3: sandstorm

Sandstorm refers to the weather phenomenon that strong winds blow up dust on the ground, making the air very turbid and the horizontal visibility less than 1 km.

4. Strong sandstorm

Strong winds blow up the dust on the ground, making the air very turbid and the horizontal visibility less than 500 meters.

5. Extremely strong sandstorm

Strong winds blow up dust on the ground, making the air particularly turbid, and the horizontal visibility is less than 50 meters.