Factories spew clouds of smoke last December in Qianan, Hebei province, said to be the main source of air pollution in Beijing, a three-hour drive away. Photo: Simon Song

Letters to the Editor, September 12, 2017

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Factories spew clouds of smoke last December in Qianan, Hebei province, said to be the main source of air pollution in Beijing, a three-hour drive away. Photo: Simon Song
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