Glossary term: 臭氧
Description: 臭氧是一种无色或淡蓝色的气体，每个分子由三个氧原子组成。它的化学式为 O₃，对人体有毒。它在大气中的比例很小，在某些区域可能不超过百万分之一。根据臭氧所在的位置不同，它可以保护或危害地球上的生命。
大部分臭氧位于平流层，它在那里起到保护地球表面免受太阳紫外线辐射的作用。由于人类将氯氟烃引入大气层，臭氧层的保护作用已经减弱，从而增加了患皮肤癌、白内障和免疫系统衰弱的风险。1987 年，《蒙特利尔议定书》禁止使用这些气体作为制冷剂和气溶胶喷雾推进剂，随后平流层臭氧层开始恢复。
在地球表面附近和对流层中，臭氧是一种非常有害的污染物，会对肺组织和植物造成损害。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
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