In meteorology, what is the dust weather divided into?

Sandstorm weather is divided into three grades: floating dust, sand blowing and sandstorm. Floating dust refers to dust and fine sand floating in the air evenly when there is no wind or the wind is weak, and people can still see people or things in the distance; Blowing sand, because the wind is strong, blows up the dust on the ground, making the air quite turbid and people can see the distance clearly; Sandstorm means that strong winds throw a lot of dust into the air on the ground, making the air particularly turbid, and people can only see things within 1 km. Stronger sandstorm winds can reach 10, and people can only see things within 50 meters, which is extremely destructive and is also called "black wind".