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北京今明达五级重度污染 为本轮空气重污染峰值

2016-12-03 09:30:47   北京青年报

两台无尘搅拌机连接脉冲除尘器,净化设备内的烟尘后再行排出摄影/本报记者魏彤

本报讯(记者王斌)昨天白天,北京市PM2.5浓度空间分布区域差异较大,东北部地区及城区部分地区呈现出优良水平,但东南部地区空气质量较差,达到中至重度污染水平。北京环保监测中心预计,昨天夜间,污染物浓度短时间上升,并影响到今明两天,空气质量为五级重度污染,为本轮污染天气的峰值。与此同时,本市依然维持空气重污染橙色预警。预计明天夜间至后天凌晨,空气质量将逐步转好。

北京青年报记者获悉,昨天凌晨到上午,受西北方向高压的作用,北京大部分地区出现了偏北风,污染水平呈“南高北低”的状态。城区由夜间的五级重度污染,回落到优良水平,而南部郊区和外围仍然维持在比较高的污染水平。比如,昨天上午,城区的能见度维持在10至15公里左右,而南部地区仅有3公里,大兴区的能见度更是降至1公里左右。

从北京及周边地区遥感影像图来看,中午前后,华北平原出现大范围灰霾,并向北扩展。北京环保监测中心预计,从昨天夜间开始,空气重污染的情况会逐渐覆盖到市区。截至昨晚7点,城区及南部地区已普遍达到重度污染水平。位于通州区的城东南区域监测站点,PM2.5浓度突破400微克/立方米,而位于延庆区的京西北区域监测站点,PM2.5浓度仅有55微克/立方米,空间分布区域差异仍然明显。

昨天,京津冀地区多个地市都启动了相应高级别的预警,体现了整个区域对空气重污染天气的联防联控。一方面积极采取应急减排措施,另一方面在有气象条件的综合作用下,尽可能减缓了污染物积累程度。“但是,像昨天那样短暂的有利扩散条件,今天就不会再出现了。预计今明两天,本市将迎来空气重污染峰值。”北京环保监测中心相关负责人表示。从昨天傍晚开始,短暂有利扩散条件消失,污染水平在比较短的时间内升到较高水平,并持续影响到今明两天。另外,随着昨晚空气湿度的进一步增加,今天局地可能会出现能见度低于1公里的情况,空气质量指数将达到五级重度污染。

预计4日夜间至5日凌晨,有冷空气渗透,扩散条件转好,霾将得到一定缓解,空气质量也会逐步转好。下周冷空气活动较为频繁,天气以晴到多云为主,气温较本周略有下降。

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