How many kinds of dusty weather are there?

Dust weather is divided into four categories.

1. floating dust: a weather phenomenon in which dust and fine sand float evenly in the air, making the horizontal visibility less than 10 km;

The so-called floating dust weather process refers to the occurrence of floating dust weather in five or more countries in the weather forecast area of China at the same observation time in the same weather process;

2. Sand blowing: the wind blows up the dust on the ground, making the air quite turbid, and the horizontal visibility is within 1 km to1km;

The so-called sand-blowing weather process refers to the occurrence of sand-blowing weather in five or more countries in China's weather forecast area at the same weather process and observation time;

3. Sandstorm: a weather phenomenon in which strong winds blow up a lot of dust on the ground, making the air very turbid and the horizontal visibility is less than 1 km;

The sandstorm weather process refers to the sandstorm weather in three or more countries in the weather forecast area of China at the same observation time;

4. Strong sandstorm: a weather phenomenon in which strong winds blow up dust on the ground, making the air very turbid and the horizontal visibility is less than 500 meters.

Strong sandstorm weather process: In the same weather process, more than three countries in China's weather forecast area basically (quasi) stand at the same observation time and have strong sandstorms.

Extended data:

Take these measures in the face of sandstorms.

1, indoor doors and windows should be closed in time, and doors and windows can be sealed with tape if necessary. Humidifier, sprinkler or wet mop should be used indoors to clean the dust and keep the air humidity appropriate.

2. When the sandstorm is about to happen or has already happened, residents should try to reduce going out. Minors should not go out. If you need to go out because of special circumstances, you should be accompanied by an adult.

3. If it is necessary to go out, residents should bring dust-proof articles such as masks or scarves. Myopia patients should not wear contact lenses to avoid eye inflammation and the damage of sandstorm to respiratory tract and eyes.

4. When the sandstorm happens, it is not suitable for outdoor sports and leisure activities. All outdoor collective activities should be stopped immediately, and people should be evacuated to a safe place to avoid.

5. In dusty weather, pedestrians should be cautious when riding bicycles, and should slow down. If the visibility is poor and the line of sight is not good, it is necessary to rely on the roadside. Pedestrians should pay attention to safety when crossing the road. Don't cross the road rashly.