1月24日14时25分，雾霾笼罩的上海市徐汇区。当日13时42分，上海中心气象局发布霾黄色预警信号：预计当日上半夜以前上海将出现能见度小于3000米的霾。新华社记者 任珑 摄     24 January 14 when 25 points,Fog haze in Shanghai xuhui district.13 when that day 42 points,Shanghai central weather bureau issued haze yellow warning signal:Before that day before midnight is expected to Shanghai will appear visibility of less than 3000 meters of haze.The xinhua news agency RenLong perturbation

    1月24日14时25分，雾霾笼罩的上海市徐汇区。新华社记者 任珑 摄       24 January 14 when 25 points,Fog haze in Shanghai xuhui district.The xinhua news agency RenLong perturbation