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Passengers look at flight information at terminal 2 of Hongqiao International Airport in Shanghai, east China, Jan. 16, 2018. Shanghai issued an orange alert for fog Tuesday morning. (Xinhua/Fang Zhe)
Passengers look at flight information at terminal 2 of Hongqiao International Airport in Shanghai, east China, Jan. 16, 2018. Shanghai issued an orange alert for fog Tuesday morning. (Xinhua/Fang Zhe)