Dissident artist Ai Weiwei posted this picture on Twitter. Photo: Twitter/Ai Weiwei

Artist Ai Weiwei dons gas mask as severe pollution continues to engulf China

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Gas mask makers cashing in on smog

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Published: 1:08pm, 15 Jan, 2013

Updated: 3:51pm, 15 Jan, 2013

Dissident artist Ai Weiwei posted this picture on Twitter. Photo: Twitter/Ai Weiwei

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