1月22日晚，北京展览馆笼罩在浓雾中。当日，北京大雾天气又“卷土重来”，城区被浓雾笼罩，能见度低。北京气象台于当日上午和下午连发两次大雾黄色预警。新华社发（王俊峰 摄） On January 22nd,Beijing exhibition hall wrapped in thick fog.the,Beijing weather and heavy fog"back",City was foggy,Low visibility.The Beijing meteorological station in the morning and afternoon volleying two fog yellow warning.The xinhua news agency hair(WangJunFeng perturbation)

     1月22日傍晚，游客带着口罩在北京国家体育场“鸟巢”前拍照。新华社发（郭海鹏 摄）      On January 22nd evening,Visitors with a mask in Beijing national stadium"Bird's nest"Front of a.The xinhua news agency hair(GuoHaiPeng perturbation)