People wear masks on a polluted day in Beijing. Photo: AFP People wear masks on a polluted day in Beijing. Photo: AFP
People wear masks on a polluted day in Beijing. Photo: AFP

Air pollution in Asia wafting over to the United States, increasing smog levels in West

People wear masks on a polluted day in Beijing. Photo: AFP People wear masks on a polluted day in Beijing. Photo: AFP
People wear masks on a polluted day in Beijing. Photo: AFP
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