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下周二空气质量转好

2017-09-02 14:35:51   中国青年网

本报讯(记者张航)秋冬季是空气重污染高发期。进入9月,空气污染有所“抬头”。从昨天到今天上午,北京部分地区已经出现重污染。记者从北京市环保监测中心获悉,未来几天京城将持续出现空气污染,预计到下周二才会转为良好。

上午8点,全市整体处于空气污染状态,其中城六区、西北部郊区的PM2.5浓度都超过了150微克/立方米,属于重度污染水平。

据介绍,从8月29日夜间开始至9月1日白天,北京市PM2.5浓度呈逐日上升特征,污染级别分别为1级优、2级良、3级轻度污染。8月31日夜间到9月1日白天,全市PM2.5浓度上升较为迅速,城区及南部地区部分站点达到重度污染水平。

为何这次污染发展如此迅速?监测中心表示,从气象条件分析来看,8月29日至9月1日,北京地区地面弱高压控制,弱南风,湿度大,总体为静稳气象条件,导致局地污染积累加重,是造成近几天北京及区域污染水平明显上升的主要原因。同时激光雷达监测也表明,存在周边区域污染物向本市输送的情况。

监测中心分析, 9月1日至4日,北京仍处于弱气压系统控制,湿度较大,总体维持静稳气象特征,污染扩散条件持续不利,空气污染偏重的情况预计仍将维持。其中今天受弱降水的影响,预计整体为轻度至中度污染;3日至4日预计空气质量为4级中度污染水平;5日受降水及北风影响,预计会有明显改善,空气质量转好至2级良。J067

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