Causes of sandstorms in Beijing

1. Due to geological reasons, Beijing belongs to the piedmont alluvial fan, and gravel can be seen 8- 10 meters underground. In recent years, Beijing has vigorously carried out infrastructure construction, and sandstorms and gravel have spread everywhere under the action of strong winds, which is one of the reasons for the frequent sandstorms in Beijing. 2. For environmental reasons, the suburbs of Beijing are cultivated land and garbage dumps, and there will be dust flying in the windy season; 3. The unburned carbon particles in automobile exhaust increase the inhalable particles in the air.

Beijing is one of the high incidence areas of sandstorm activities and sandstorms. The so-called sandstorm activity is a series of physical phenomena caused by strong winds acting on the dry surface. Usually, fine dust flies into the atmosphere and is in a suspended state, which is affected by the spatial movement of the atmosphere. Dust moves to tens of kilometers, hundreds of kilometers, thousands of kilometers and tens of thousands of kilometers by means of high-altitude airflow.

Sandstorm weather will cause houses to collapse, traffic power supply to be blocked or interrupted, fires, human and animal casualties and so on. It pollutes the natural environment, destroys the growth of crops and causes serious losses and great harm to the national economic construction and the safety of people's lives and property.

According to experts, there are two views on the source of sandstorms in Beijing. One view is to "raise sand on the spot". The "Three Rivers and Two Beaches" represented by Yongding River, Chaobai River, Dasha River Basin, Kangzhuang and Nankou are the main sandstorm hazard areas in Beijing. There is also a view that the sandstorm with big climate comes from the deserts of foreign countries such as Mongolia, the deserts and sandy land in the northwest of China, and the sand blown from the degraded and desertified land in the farming-pastoral ecotone in these areas.