The chlorine atom is then free to react with an ozone molecule, taking one of the oxygen atoms to form chlorine monoxide.

然后，氯原子就可以自由地与臭氧分子反应，结合一个氧原子，形成一氧化氯。

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Ozone is a version of oxygen with three atoms per molecule, whereas normal, everyday oxygen has only two.

ECONOMIST: Atmospheric science: Fake flakes | The