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新京报快讯(记者邓琦)9月1日起,北京开始新一轮空气污染过程。北京市环保监测中心今日(9月4日)表示,本轮污染主要因本地污染排放,机动车排放贡献较大。
市环保监测中心介绍,本次污染过程受到一定不利气象条件和区域的影响,但更重要的还是由于北京本地污染排放。从这几天PM2.5的组成来看,硝酸盐占比最大。9月1日和2日硝酸盐在PM2.5组成中分别占比23%与26%,今日到目前达到了30%。今日城区硝酸盐浓度从凌晨到中午增加了3倍左右,是污染形成的最主要原因。
市环保监测中心表示,硝酸盐主要来自于气态氮氧化物的二次转化,而北京非采暖季气态氮氧化物主要来自机动车的排放。本次污染过程中硝酸盐占比居高不下,反映出静稳条件下机动车污染贡献较大,且有不断增加的趋势。其中,机动车排放受柴油大货车影响大。从交通站点氮氧化物以及黑炭的监测结果看,夜间浓度往往是白天的2-4倍,进京柴油大货车对空气质量起到重要影响作用;从排放总量来看,国Ⅲ及以上排放标准的重型柴油车排放的氮氧化物和一次颗粒物可占全市机动车排放总量的50%以上和90%以上。
市环保监测中心预计,今日受低压控制,扩散条件较不利,预计空气质量为三级轻度污染。5日,受弱冷空气和降水影响,扩散条件转为有利,预计空气质量为二级良。6日,弱冷空气持续作用,空气质量维持二级良水平。
责任编辑:李皓 CN002
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