1月22日，北京北四环被大雾笼罩。当日，北京市气象台发布大雾黄色预警信号，目前本市东部地区有雾，局地能见度小于500米，市民需注意防范。新华社记者 王申 摄  On January 22,,Beijing north is heavy fog shrouded.the,The Beijing meteorological observatory issued the fog yellow warning signal,At present this city east of fog,Local visibility of less than 500 meters,People need to pay attention to the prevention.The xinhua news agency WangShen perturbation 

    1月22日，在北京北四环，行人在大雾中走在过街天桥上。新华社记者 王申 摄 On January 22,,In the north of Beijing,Pedestrians in the heavy fog walk in the street on the bridge.The xinhua news agency WangShen perturbation

    1月22日，在北京北四环，行人在大雾中走过人行横道。新华社记者 王申 摄 On January 22,,In the north of Beijing,Pedestrians in the heavy fog through pedestrian crossing.The xinhua news agency WangShen perturbation