A pedestrian wearing mask walks on a street in Beijing, capital of China, Oct. 18, 2016. A yellow alert for air pollution was issued on Tuesday in Beijing. (Xinhua/Ju Huanzong)
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A pedestrian wearing mask walks on a street in Beijing, capital of China, Oct. 18, 2016. A yellow alert for air pollution was issued on Tuesday in Beijing. (Xinhua/Ju Huanzong)
