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Associated Press
A woman wearing a mask to protect herself from pollutants walks past a construction site on a heavily polluted day in Beijing, Monday, Nov. 30, 2015. Beijing on Sunday, Nov. 29 issued its highest smog alert of the year following air pollution in capital city reached hazardous levels as smog engulfed large parts of the country despite efforts to clean up the foul air. (AP Photo/Andy Wong)

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