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BEIJING, CHINA - DECEMBER 31: A farmer walks at suburbs in heavy smog on December 31, 2016 in Beijing, China. Beijing Meteorological Bureau has issued an orange alert for heavy smog from December 30 to January 1. (Photo by Lintao Zhang/Getty Images)

BEIJING, CHINA - DECEMBER 31: A farmer walks at suburbs in heavy smog on December 31, 2016 in Beijing, China. Beijing Meteorological Bureau has issued an orange alert for heavy smog from December 30 to January 1.  (Photo by Lintao Zhang/Getty Images)