In this Feb. 21, 2017 photo, commuters, some wearing masks, walk to a subway station to a subway station during the evening rush hour in Beijing. Yet the city’s average reading of the tiny particulate matter PM2.5 - considered a good gauge of air pollution - is still seven times what the World Health Organization considers safe. A group of Chinese lawyers is suing the governments of Beijing and its surrounding areas for not doing enough to get rid of the smog. (AP Photo/Andy Wong)
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