前驅物又稱母體物。某些一次污染物能轉化成二次污染物,則前者為後者的前驅物。如二氧化硫硫酸硫酸鹽的前驅物,二氧化氮硝酸硝酸鹽的前驅物。在大氣化學反應過程中,前驅物往往是化學反應中的反應物,其生成物為二次污染物。

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