What are the main causes of sandstorm weather?

Sandstorm weather is frequent in winter and spring, which is due to less precipitation in winter and spring in semi-arid and arid areas, extremely dry and loose surface and weak wind erosion resistance. When there is strong wind, there will be a lot of dust in the air, which will further constitute sandstorm weather. Strong wind, strong thermal instability and sand source are the three most important conditions for the formation of sandstorms.

The main causes of sandstorm or strong sandstorm are favorable weather conditions, favorable dust source distribution and favorable unstable air conditions. Strong wind is the driving force of sandstorm, and the source of sandstorm is the material basis of sandstorm. Strengthen vegetation planting, strengthen biological protection system and resist sandstorms. Protect and restore forest and grassland vegetation according to law, prevent land desertification from expanding, and minimize dust sources. The unstable thermal environment is conducive to the increase of wind power and strong convection, thus carrying more dust and lifting higher.

Sandstorm is not only the product of specific natural environment, but also has a corresponding relationship with human activities. Man-made overgrazing and deforestation, industrial and mining traffic construction, especially man-made overgrazing, destroyed the ground vegetation, disturbed the ground structure, formed a large area of sandy land, and directly accelerated the formation and development of sandstorms.

Medical experts say that dust is the most harmful to the human respiratory system and people should not underestimate it. Especially the elderly, infants and patients with respiratory allergic diseases with poor resistance, try to stay away from dust sources. Medical experts say that dusty weather, especially when sandstorms occur, may induce allergic diseases, epidemics and infectious diseases. Usually, people's nasal cavity, lungs and other organs can filter dust to a certain extent, but sandstorm, a bad weather phenomenon, will bring too much and too dense fine dust.

Strong winds span thousands of kilometers, and bacteria are brought with them, which may include some infectious bacteria. Medical experts suggest that when some people in the city have to go outdoors because of professional needs, it is best to protect their eyes and mouths with wet towels and scarves.