Chinese residents breathe "mountain air" in Zhengzhou, Henan province, during a travel company's promotion stunt in March last year. Photo: AFP

China's environmental chiefs summon Zhengzhou mayor over worsening smog

Environmental Protection Ministry uses new powers to order officials to explain their plans

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Chinese residents breathe "mountain air" in Zhengzhou, Henan province, during a travel company's promotion stunt in March last year. Photo: AFP
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