China's Xi'an Shrouded In Smog

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Vehicles are driven past the Bell Tower as heavy smog engulfs the... News PhotoBell Tower - Tower,City,Environmental Issues,Horizontal,Mode of Transport,Smog,Xi'anPhotographer Collection: Visual China Group 2013 ChinaFotoPressXI AN, CHINA - DECEMBER 18: (CHINA OUT) Vehicles are driven past the Bell Tower as heavy smog engulfs the city on December 18, 2013 in Xi An, China. Heavy smog has shrouded Xi'an for two days, and local environment agency advised people to stay indoors. (Photo by ChinaFotoPress/ChinaFotoPress via Getty Images)