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专家谈不一样的北京雾霾：重污染发生四大变化
source link: http://tech.sina.com.cn/d/n/2018-03-28/doc-ifysskmf4293172.shtml
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污染时长、浓度峰值、空间分布和污染物组分与往年不同——重污染发生四大变化本报记者骆倩雯这两天，雾霾又来了，北京处于空气重污染橙色预警之下，全市PM2.5平均浓度在200微克/立方米上下。这一次重污染过程将持续三天，“比起以前动不动就长达一周
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