10月30日上午开始,北京空气质量预计逐步改善|公日日躁我和公乱口述

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  中新网北京10月29日电 (陈杭)北京市生态环境监测中心官方微博29日通报称,根据最新空气质量预报结果,30日凌晨起,冷空气逐渐影响北京,预计30日上午开始,受北部高压作用,北京扩散条件好转,空气质量逐步改善。

  据介绍,27日起,京津冀区域出现强逆温、高湿度、强辐合、偏南风的不利扩散条件,发生一次区域性污染过程,临近北京市周边的多个城市空气质量达到4级中度-5级重度污染。在偏南风的持续作用下,区域传输叠加北京积累,北京PM2.5浓度迅速升高,由28日上午的1级优快速上升,28日傍晚开始达到4级中度污染。

  北京市生态环境监测中心表示,秋冬季京津冀及周边区域易发生PM2.5污染过程,主要原因是秋冬季易形成静稳、逆温天气,边界层低,大气扩散能力明显下降。同时,大气相对湿度增加,夜间和清晨常出现近饱和,在高湿度条件下,叠加秋冬季区域污染排放较夏季相对增加,PM2.5二次转化反应增强,容易造成PM2.5快速积累升高。

  北京市生态环境监测中心表示,具体到本次污染过程,主要是显著不利气象条件影响下的区域污染传输和本地污染积累导致。28日夜间至29日,京津冀及周边地区多个城市有大雾天气,部分地区局地有能见度不足200米的强浓雾,北京相对湿度接近饱和;中层明显回温,夜间至清晨存在高达8摄氏度的逆温,边界层高度降至500米,高湿逆温的扩散条件导致污物持续汇聚、积累、二次转化。

  此外,区域传输贡献突出,偏南风下区域南部高浓度污染团持续向北京传输汇聚,PM2.5组分分析显示,代表区域燃烧源的硫酸盐、氯离子上升幅度突出,传输模型解析本次过程中区域传输对北京贡献超七成。(完)

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