On March 20 and from April 6 to 8, 2002, Beijing suffered from the strongest sandstorms. Statistics show that starting from 1997, dust floating increased by degree in Beijing...

Beijing's sandstorm is the result of mutual roles from human activities and the natural condition. Sand source exists in Beijing and surrounding areas. The human destruction to the ecological environment and unscientific usage of water resources are the major factors to cause the sandstorm...