2015年12月19日，在北京市朝阳区三里屯街头，面对严重的雾霾，一名行人带上了造型独特的口罩。[中国网 郭翊明 摄]
A woman wearing a unique mask to protect her from serious smog walks through the Sanlitun streets in Beijing's eastern Chaoyang District on Dec. 19, 2015. [Photo by Guo Yiming/China.org.cn]