1月20日，长春市被雾霾笼罩。当日，长春市再次出现雾霾天气。截至上午10时，长春市环境空气质量实时发布系统显示，长春市细颗粒物PM2.5浓度最近多个小时持续攀升，10时达到每立方米340.7微克（一小时浓度）。新华社记者 齐海山 摄      1 month and day,Changchun be fog haze shrouded.the,Changchun appear again fog haze weather.By morning 10,Changchun city ambient air quality real-time release system display,Changchun fine particles PM2.5 concentrations in recent several hours continue to rise,10 per cubic meters 340.7 micrograms(An hour concentration).The xinhua news agency JiHaiShan perturbation