Photo taken on Dec. 23, 2015 shows a man walking in smog in Zixia Park, Wenxian County, central China's Henan Province. (Xinhua/Xu Hongxing)
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Photo taken on Dec. 23, 2015 shows a man walking in smog in Zixia Park, Wenxian County, central China's Henan Province. (Xinhua/Xu Hongxing)