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

Gas mask makers cashing in on smog

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