Mr. Han sweeps the dust from his car in Beijing, capital of China, on April 17, 2006.(Xinhua Photo)

A dust-covered car is parked in front of a vehicle-washing shop in Beijing, capital of China, on April 17, 2006.(Xinhua Photo)

Vehicles drive in a street in Beijing, capital of China, on April 17, 2006.(Xinhua Photo)

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