Many Cities In China Shrouded In Fog

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Students of Liaocheng University wearing masks campaign for better... Fotografía de noticiasAlerta,China,Ciudad,Horizontal,Medio ambiente,Niebla,Objeto creado por el hombre,Tiempo atmosférico,Valla publicitariaPhotographer Collection: ChinaFotoPress 2013 ChinaFotoPressLIAOCHENG, CHINA - JANUARY 15: (CHINA OUT) Students of Liaocheng University wearing masks campaign for better environmental awareness with handmade billboards as heavy fog engulfs the city on January 15, 2013 in Liaocheng, China. A thick fog continued to shroud central and eastern parts of China on Tuesday, leading to flight delays and expressway closures. (Photo by ChinaFotoPress/ChinaFotoPress via Getty Images)