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A pedestrian wearing a mask looks back while passing by a slogan that reads: "If you want to go out, please take a public bus" in Beijing Monday, Jan. 2, 2017. Beijing and other cities across northern and central China were shrouded in thick smog Monday, Jan. 2, 2017, prompting authorities to delay dozens of flights and close highways. (AP Photo/Andy Wong)

A pedestrian wearing a mask looks back while passing by a slogan that reads: "If you want to go out, please take a public bus" in Beijing Monday, Jan. 2, 2017. Beijing and other cities across northern and central China were shrouded in thick smog Monday, Jan. 2, 2017, prompting authorities to delay dozens of flights and close highways. (AP Photo/Andy Wong)

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