Causes, harm and prevention measures of sandstorm

The causes, hazards and prevention measures of sandstorm are as follows:

The formation of sandstorms requires these three conditions: first, the dust material on the ground. It is the material basis for the formation of sandstorms. The second is the strong wind. This is the dynamic basis for the formation of sandstorms and the dynamic guarantee for the long-distance transportation of sandstorms. Third, the air state is unstable. This is an important local thermal condition. Sandstorms often occur in the afternoon and evening, which shows the importance of local thermal conditions.

Hazards of sandstorms:

1、? Environmental pollution. 2. Production and life are affected. 3. Loss of life and property. 4. Affect traffic safety. 5, endangering human health. 6. Land degradation.

Dust storm prevention measures: 1. When a sandstorm occurs, outdoor sports and leisure activities are not suitable. All outdoor collective activities should be stopped immediately, and people should be evacuated to a safe place to hide. 2. In case of sandstorm, pedestrians should hide in a solid leeward place without falling objects. Pedestrians suddenly encounter a strong sandstorm on the way, so they should find a safe place to hide. 3. Try to avoid going out. Inhaling too much dust can easily cause lung diseases, especially for children, so people should try to reduce the travel in dusty weather.

4. Pay attention to blocking dust when going out. Pay attention to carry masks, scarves, wet towels, goggles and other dust-proof products to avoid dust damage to eyes and respiratory tract. 5. Don't wear contact lenses. In dusty weather, nearsighted people should try to wear ordinary frame glasses. Contact lenses are not easy to clean when dust enters the eyes, which easily leads to the growth of eye germs.

National standard of sandstorm:

① Yellow warning of sandstorm. Standard: sandstorm weather may occur within 12 hours (visibility is less than 1000m), or sandstorm weather has occurred and may occur and may continue.

② orange warning of sandstorm. Standard: Strong sandstorm weather may occur within 6 hours (visibility is less than 500 meters), or sandstorm weather has appeared and may appear and may continue.

③ Red warning of sandstorm. Standard: Extreme sandstorm weather may occur within 6 hours (visibility is less than 50 meters), or sandstorm weather has occurred and may occur and may continue.

According to the intensity level:

Generally, wind speed and visibility are used to classify the intensity grade of sandstorm. At present, the intensity of sandstorms is divided into four grades:

① Level 4 ≤ Wind speed ≤ 6, 500m ≤ visibility ≤ 1000m, which is called weak sandstorm;

(2) Medium-intensity sandstorm with wind speed of 6 ≤8 and visibility of 200 meters ≤500 meters;

(3) The wind speed ≥ 9,50m ≤ visibility ≤ 200m, which is called a strong sandstorm;

④ When it reaches its maximum intensity (instantaneous maximum wind speed ≥ 25m/s, visibility ≤ 50m, or even reduced to 0m), it is called extremely strong sandstorm (or black storm, commonly known as "black wind").