When does the sandstorm appear in the north?

Hello, it's usually March and April in spring, December in winter and January of the following year. Due to the scarcity of vegetation, more sandy soil and frequent cold waves and strong winds in the north and northwest of China, sandstorms are prone to occur in the spring when the climate is relatively dry. Therefore, the sandstorm season in Beijing should be winter and spring.

Sandstorm is a general term for sandstorm and sandstorm. It refers to a severe sandstorm weather phenomenon in which strong winds blow up a large amount of sand and dust substances on the ground and drag them into the air, making the air particularly turbid and the horizontal visibility less than 1 km. Among them, sandstorm refers to a sand-laden storm formed by strong winds blowing a large number of sand near the ground; Sandstorm is a storm formed by strong winds, which brings a lot of dust and other particles into the sky.

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Harm of sandstorm

1. Deterioration of ecological environment: When sandstorms occur, there are dust and floating dust wrapped in strong winds everywhere, and the number of people passing through areas with frequent diseases such as air turbidity, choking nose and eyes, and respiratory diseases increases. For example,1A serious sandstorm occurred in Jinchang on May 5, 993. The dust content in outdoor air is 10 16 mm/cm3, and the dust content in indoor air is 80 mm/cm3, which is 40 times higher than the national standard for dust content in living quarters.

2. Production and life are affected: a large amount of dust carried by sandstorm weather blocks the sun, and the weather is gloomy, resulting in a decrease in solar radiation. The visibility difference is several hours to more than ten hours, which can easily make people feel depressed and reduce the efficiency of work and study. In light cases, a large number of livestock can be infected with respiratory and gastrointestinal diseases, and in severe cases, a large number of "spring-deficient" livestock will die, and fertile soil, seeds and seedlings in farmland will be scraped away. Sandstorm will also aggravate the wind erosion and desertification of the surface soil, cover thick dust on the leaves of plants, affect normal photosynthesis and cause crop yield reduction.

3. Impact on traffic safety: Sandstorm weather often affects traffic safety, causing planes to fail to take off or land normally, causing cars and train carriages to be damaged, stopped or derailed.

4. Human health: When people are exposed to dusty weather, dust containing various toxic chemicals and bacteria can enter the mouth, nose, eyes and ears through layers of protection. Dust containing a lot of harmful substances, if not cleaned up in time, will damage these organs or take these organs as the attack point and cause various diseases: sandstorm weather mainly occurs in late spring and early summer, because there is little precipitation in winter and spring in arid areas, the surface is unusually dry and loose, and the wind erosion resistance is very weak. When there is a strong wind, it is for reference only. ...