An Air China passenger plane prepares to land at the Beijing Capital International Airport as the capital of China through heavy smog on Wednesday, Dec. 21, 2016. Beijing and much of industrial northern China are in the midst of a "red alert," the highest level in China's four-tiered pollution warning system. The alert has affected 460 million people, according to Greenpeace East Asia, which calculated that about 200 million people were living in areas that had experienced levels of air pollution more than 10 times above the guideline set by the World Health Organization. (AP Photo/Andy Wong)
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