Photo taken on Jan. 6, 2017 shows the downtown area shrouded in heavy smog in Hohhot, capital city of north China's Inner Mongolia Autonomous Region. (Xinhua/Deng Hua)
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Photo taken on Jan. 6, 2017 shows the downtown area shrouded in heavy smog in Hohhot, capital city of north China's Inner Mongolia Autonomous Region. (Xinhua/Deng Hua)