臭氧
臭氧（分子式为O3）是氧气（O2）个同素异形体，拉常温下，渠是一种有特殊臭味个无色气体。英文臭氧（Ozone）一词源自希腊语ozon，意为“嗅”。
臭氧主要存在拉距地球表面20公里个平流层下部个臭氧层中，含量约50ppm。渠吸收对人体有害个短波紫外线，防止渠到达地球。O2经紫外光照射而得。
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