A visitor wearing a cap and mask poses for a photo at Tian'anmen Square as the worst smog in decades continued to rise to dangerous levels in Beijing on Jan 23, 2013. [Photo by Wang Wenlan/Asianewsphoto]
Visitors wear masks waiting for the flag-raising ceremony at Tian'anmen Square as the worst smog in decades continued to rise to dangerous levels in Beijing, Jan 29, 2013. [Photo by Liu Hui/Asianewsphoto]
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