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北京市环保监测中心:今日下午沙尘污染基本结束

2017-05-05 11:01:56   北京晨报

今天将是超级大风天,市气象台已发布大风黄色预警信号,预计今天白天有五六级偏北风,阵风可达八九级,局地伴有扬沙,市民外出需注意防风防尘。

今日下午沙尘污染基本结束

由于沙尘的范围较大,昨日下午PM10高浓度仍持续,不过随着偏北风的持续作用,昨日夜间PM10浓度将有明显下降。市环保监测中心表示,今天上午,西北冷高压锋面过境,本市仍将受到新一股大风沙尘污染影响,但污染程度比4日明显偏轻。今天下午,随着高气压控制本市,沙尘污染基本结束,空气质量有所转好,空气质量预计为四级中度污染,预计6日为2级良,7日空气质量在2级良到3级轻度污染;8日为3级轻度污染到4级中度污染。

数字

20世纪50年代

北京沙尘最严重,春季沙尘日数平均多达26天。

20世纪60年代至80年代

北京沙尘日数有所下降,在10-20天之间波动。

20世纪90年代以后

北京沙尘日数明显下降,平均不到5天。

2001年-2010年

北京沙尘日数又略有增加,平均在7天左右。

2015年4月15日

距离2002年3月20日北京城区出现沙尘暴后13年,京城出现最强一次沙尘天气,为大范围沙尘暴。当天,沙尘暴蓝色预警发布一个多小时后就升级为黄色预警。

2011年-2016年

北京平均沙尘日数在3天左右。

2017年4月17日

傍晚至18日早晨,京城出现了一次局地扬沙天气,主要出现在怀柔、密云和通州的局部地区。

分析不按常理出牌

针对比次沙尘暴过程,中国环境监测总站专家表示,多年以来,我国沙尘暴的主要传输途径多来自新疆、青海、甘肃等西北方向。但本次沙尘却不按常理出牌,北部蒙古国和内蒙古西部沙尘同时形成,合力突袭华北。5月3日中午,沙尘已初步形成,5月3日晚,“沙尘军团”兵临我国北方边境,5月4日凌晨,在并没有强风助力的情况下,悄无声息深入我国华北腹地。恰逢华北昨天该来的小雨还未露面就消失不见,没有经过清洗的空气无力抵抗沙尘的进攻,1~2小时内,AQI即达到严重污染。

近日东北部分城市出现重度和严重污染是否与沙尘有关?对此,专家表示,东北地区的污染是由于4月30日俄过境大火蔓延内蒙古大兴安岭林区伊木河林场导致,与本次华北地区沙尘过程无关。

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