The Beijing Meteorological Observatory was upgraded on Wednesday (March 22) to release the sand and dust bullyly warning signal in the morning, and the minimum visibility of most areas is less than one kilometer.Affected by cold air, the weather invasion of strong sandstorms in most regions of northern China for two days is the widest influence this year. It is expected that it will gradually weaken until the day (March 23) during Thursday (March 23).The picture shows the high -rise buildings in the Beijing Business Center area shrouded in sand.(Reuters)
