A woman wearing a mask walks on a smog-enveloped road in Changchun, capital of northeast China's Jilin Province, Oct. 25, 2015. (Photo: Xinhua/Lin Hong)
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A woman wearing a mask walks on a smog-enveloped road in Changchun, capital of northeast China's Jilin Province, Oct. 25, 2015. (Photo: Xinhua/Lin Hong)
