China Issues Yellow Fog Alert

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People wearing masks do morning exercises as heavy fog engulfs the... News PhotoChina - East Asia,City,Fog,Horizontal,Morning,People,Pollution,WeatherPhotographer Collection: ChinaFotoPress 2013 ChinaFotoPressFUYANG, CHINA - JANUARY 14: (CHINA OUT) People wearing masks do morning exercises as heavy fog engulfs the city on January 14, 2013 in Fuyang, China. China's meteorological authority issued a yellow alert for fog on Sunday. A thick fog continued to shroud central and eastern parts of China, leading to flight delays and expressway closures last weekend. (Photo by ChinaFotoPress/ChinaFotoPress via Getty Images)