The dusty weather is coming again. How is this weather formed? How to defend?

At the turn of winter and spring, it is the season of sandstorm in China. Because the climate in the north is relatively dry and windy, there is dust everywhere. Usually, the transition from winter to spring is a sandstorm season in China, because the climate in the north is relatively dry at this time, coupled with windy weather, so dust is everywhere.

Specific formation conditions, weather conditions are conducive to strong winds or strong winds, favorable distribution of dust sources and favorable unstable air conditions are the main reasons for the formation of sandstorms or strong sandstorms. Wind is the driving force of sandstorm, and dust source is the material basis of sandstorm formation. Unstable thermal conditions are conducive to the development of wind and strong convection, thus carrying more dust and forming a higher vortex. Coupled with favorable large-scale environment, high-altitude dry and cold jet, strong vertical wind speed, wind shear and thermal instability stratification, the formation and development of mesoscale system near the front area, the pressure and temperature gradient before and after the front are enhanced, forming a huge pressure and temperature gradient before and after the front. It is the simultaneous action of momentum downward transfer and gradient deflection wind, and the surface wind speed rises sharply, causing the surface dust to rise, forming sandstorm or strong sandstorm weather.

Hazards to human health: Medical experts say that dust is the most harmful to human respiratory system, and people should not take it lightly. In particular, the elderly, infants and patients with respiratory allergic diseases with poor resistance should stay indoors, close doors and windows and try to stay away from dust sources. Medical experts say that in dusty weather, especially sandstorms, allergic diseases, epidemics and infectious diseases may be induced. Under normal circumstances, people's nasal cavity, lungs and other organs have a certain filtering effect on dust, but the fine dust caused by severe weather phenomena such as sandstorm is too dense, which is easy to lead to the recurrence of patients with respiratory allergic diseases. If you inhale dust for a long time, you will have uncomfortable symptoms such as cough and wheezing, which will lead to the outbreak of the epidemic.

We should strengthen environmental protection and put it at the height of the legal system. Destroy vegetation and strengthen the biological protection system against wind and dust. Protect and restore forest and grass vegetation according to law, prevent further desertification, and minimize dust sources. We should control population growth, reduce the pressure of human factors on land and protect the environment. Linking the relationship between the occurrence and harm of sandstorms and human activities with scientific propaganda makes people realize that once their living environment is destroyed, it is difficult to recover, which not only aggravates natural disasters such as sandstorms, but also forms a vicious circle, so people should consciously protect their living environment. Seabuckthorn and other desert arid areas are suitable for planting in desert areas to form ground cover, improve ground cover environment, fix soil, reduce wind speed, increase air humidity and improve microclimate environment. Local low shrubs and small trees were planted at the edge of the desert to improve the vegetation distribution.