夏季随着颗粒物污染的加重，含硫颗粒物的数目百分数增加，是北京市大气颗粒物污染的重要特征。
When aerosol pollution was getting worse in summer in Beijing, increasing number percentage of S-containing particles featured the atmospheric aerosol.
夏季随着颗粒物污染的加重，含硫颗粒物的数目百分数增加，是北京市大气颗粒物污染的重要特征。
When aerosol pollution was getting worse in summer in Beijing, increasing number percentage of S-containing particles featured the atmospheric aerosol.
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