王书肖表示，根据清华大学团队此前的测算，如果全国PM2.5浓度要降到25微克/立方米以下，主要大气污染物的排放量还需下降30%左右。随着我国治理行动步入深水区，末端治理减排的空间越来越小，更依赖源头治理——即转变社会经济发展方式，实行能源结构调整、产业结构升级和交通运输结构清洁化等。
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