Photo taken on Oct. 13, 2016 shows buildings shrouded in smog in Beijing, capital of China, Oct. 13, 2016. A blue alert for air pollution was issued on Thursday in Beijing. (Photo/Xinhua)
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Photo taken on Oct. 13, 2016 shows buildings shrouded in smog in Beijing, capital of China, Oct. 13, 2016. A blue alert for air pollution was issued on Thursday in Beijing. (Photo/Xinhua)
