CHANGSHA, CHINA - JANUARY 14: (CHINA OUT) Buildings are shrouded in smog on January 14, 2014 in Changsha, Hunan Province of China. China's Meteorological Administration issued a yellow warning in some southern areas on Tuesday. China uses a four-tier warning system for extreme weather and air pollution, with red the most serious, followed by orange, yellow and then blue. (Photo by VCG/VCG via Getty Images)
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