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)
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)