这个词是什么意思？
Any substance in the air which could, if present in high enough concentration, harm humans, animals, vegetation or materials. Substances include GASES; PARTICULATE MATTER; and volatile ORGANIC CHEMICALS.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D000393 · MeSH 2026。
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