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The ozone molecule is unstable (although, in the stratosphere, long-lived) and when ultraviolet light hits ozone it splits into a molecule of O 2 and an individual atom of oxygen, a continuing process called the ozone-oxygen cycle.
The ozone molecule (O3) is harmful to air quality, outside of the ozone layer. EPA regulations help states reduce ozone levels in their outdoor air. Public Hearing on EPA's Response to Clean Air Act 176A Petition from 9 States Rescheduled for April 13, 2017.