Only 2—4 ring PAHs were detected in gas phase, and phenanthrene was the most abundant with an average of 55.1% in total PAHs.

结果显示，气相中主要是2—4环的多环芳烃，其中菲为主要的化合物，平均占到总多环芳烃的55.1%。

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Only 2—4 ring PAHs were detected in gas phase, and phenanthrene was the most abundant with an average of 55.1% in total PAHs.

结果显示，气相中主要是2—4环的多环芳烃，其中菲为主要的化合物，平均占到总多环芳烃的55.1%。

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