Online sales of imported face masks, such as this one made by 3M, more than tripled during November says Tmall. Photo: Reuters

Sales of top-end face masks and air purifiers soar as smog continues to cloak northern China

Tmall sales more than triple during November as tens of millions of residents, particularly in Beijing, ready themselves to battle against the toxic air

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Online sales of imported face masks, such as this one made by 3M, more than tripled during November says Tmall. Photo: Reuters
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