Massive sandstorms choke cities across China

Sandstorms whipping across China shrouded cities in an unhealthy cloud of sand and grit Monday, with winds carrying the pollution outside the mainland as far as Hong Kong and Taiwan. It was the latest sign of the effects of desertification: Overgrazing, deforestation, urban sprawl and drought have expanded deserts in the country's north and west.
The shifting sands have gradually encroached onto populated areas and worsened sandstorms that strike cities, particularly in the spring. Winds blowing from the north-west have been sweeping sand across the country since Saturday, affecting Xinjiang in the far west all the way to Beijing in the country's east. The sand and dust were carried to parts of southern China and even to cities in Taiwan, 1600 miles (2600 kilometres) away from Inner Mongolia where much of the pollution originated.
The sandstorm in Taiwan, an island 100 miles (160 kilometres) away from the mainland, forced people to cover their faces to avoid breathing in the grit that can cause chest discomfort and respiratory problems even in healthy people. Drivers complained their cars were covered in a layer of black soot in just 10 minutes.
The airport on the Taiwanese-controlled islet of Matsu, just off the mainland coast, suspended services Sunday due to poor visibility caused by the sandstorm. In Hong Kong, environmental protection officials said pollution levels were climbing as the sandstorm moved south. Twenty elderly people sought medical assistance for shortness of breath, Hong Kong's radio RTHK reported. The Hong Kong government urged people to stay indoors and encouraged schools to cancel sports events.
The latest sandstorm was expected to hit South Korea on Tuesday, said Kim Seung-bum of the Korea Meteorological Administration. The sandstorm that raked across China over the weekend caused the worst "yellow dust" haze in South Korea since 2005, and authorities issued a rare nation-wide dust advisory. Grit from Chinese sandstorms has been found to travel as far as the western United States.
China's Central Meteorological Station urged people to close doors and windows, and cover their faces with masks or scarves when going outside. Sensitive electronic and mechanical equipment should be sealed off, the station said in a warning posted Monday on its Web site.