霾平线 (IMAGE) Institute of Atmospheric Physics, Chinese Academy of Sciences Caption 2016年12月16日下午,在中国北京,国贸地区高约400米的“首都第一高楼”中国尊顶层(仍在修建中),雾霾和蓝天形成明显的分界线。(封面背景照片拍摄:京华时报 潘之望) Credit Advances in Atmospheric Sciences Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.