Beijing hit by sandstorms and severe air pollution

According to China Central Television on April 11, the minimum visibility in most areas of Beijing is between 1 and 4 kilometers, under yellow warnings for strong winds and sandstorms. In addition, the wind in Beijing is very strong during the day, with gusts of level 8 to level 9.

(Photo: CNN)

China's sandstorm warning signals are divided into three levels of color from weak to strong: yellow, orange and red. The yellow warning standard means sandstorm weather is likely to occur within 12 hours and visibility is less than 1,000 meters or sandstorm has occurred and may continue.

According to meteorological experts, this sandstorm originated in southern Mongolia, then moved south and affected most of the areas north of the Yangtze River in China. The overall intensity and scope are weaker than the strong sandstorm from March 19 to 24, and this sandstorm is expected to end on the evening of April 11.

According to statistics, more than 70% of annual dusty weather in China occurs in spring, most frequently in April, followed by March and May.

Wu Ba, director of the Institute of Desertification Research at the Chinese Academy of Forestry Sciences , said that China's main sources of sandstorms are concentrated in desert areas such as southern Xinjiang, the Gansu-Hexi Corridor, and central and western Inner Mongolia. The restoration of vegetation in these areas has played a certain role in reducing the amount of dust from the source and the damage caused by sandstorms.

The Gobi Desert in southern Mongolia is the main source of dust storms that affect China. During this time, rainfall in Mongolia and northern China decreases, and the surface sand becomes loose. In addition, strong winds from the north in spring combine with the surface sand to create frequent dusty weather.

Tuan Dat (VOV-Beijing)

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Source: https://vtc.vn/bac-kinh-hung-chiu-bao-cat-va-o-nhiem-khong-khi-nghiem-trong-ar764900.html