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PM2.5“退场” 臭氧轻度污染
2017-08-06 15:02:01 中国青年网
本报讯(记者张航)今天的北京城重现蓝天白云。截至上午记者发稿时,全市空气质量优良。市环保监测中心表示,今天白天日照较好,预计臭氧成为首要污染物,污染等级为三级轻度污染。据悉,下周本市空气首要污染物预计依然会由臭氧来“唱主角”,PM2.5浓度不会太高。
今天早晨8时,北京城空气清新。全市除了通州、大兴等东南部郊区PM2.5浓度水平为二级良好外,其余各地区PM2.5浓度水平均为一级优,其中城六区PM2.5浓度仅25微克/立方米。据介绍,最近一段时间,PM2.5污染已经“退场”,臭氧污染唱起了“主角”。以昨天下午4时为例,城六区臭氧浓度达211微克/立方米。房山、门头沟等西南部郊区最高,达231微克/立方米。监测中心表示,未来一段时间本市依然以臭氧为首要污染物,从今天一直到下周三,臭氧污染均可达轻度污染水平。另据了解,环保部中国环境监测总站预报,未来10天,京津冀地区大气扩散条件前期一般,后期总体较好。区域大部空气质量以良至轻度污染为主,中南部部分地区局部时段臭氧浓度可能偏高。J067
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