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

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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