A woman wearing a face mask walks on a street on a smoggy day in Beijing, June 23, 2015. Beijing was hit by serious air pollution on Tuesday. (Photo: China News Service/Li Huisi)
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A woman wearing a face mask walks on a street on a smoggy day in Beijing, June 23, 2015. Beijing was hit by serious air pollution on Tuesday. (Photo: China News Service/Li Huisi)
