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How ozone can be both a pollutant and an environmental asset

Ozone near the earth's surface is considered a pollutant, yet we need it in the stratosphere to protect us from uv radiation. Explain this seeming contradiction.

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High in the stratosphere, ozone (O3) is broken into O2 and O when struck by UV light. In the process it ...

Solution Summary

Ozone's function depends on its location within the atmosphere.