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OZ3

Ozone is formed when an oxygen radical reacts with a molecule of dioxygen:

\begin{equation} O+O_{2}\Rightarrow O_{3}\nonumber \\ \end{equation}
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    Oxygen radicals are formed by the dissociation of \(O_{2}\), which requires an electric charge or UV

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    Explains tang of ozone near electrics

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    Ozone in troposphere is formed from reactions in photochemical smog

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      Action of UV on nitrogen dioxide

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    In the stratosphere, oxygen can photodissociate:

\begin{gather*} O_{2}+hv\Rightarrow O+O \\ O+O_{2}\Rightarrow O_{3} \\ O+O\Rightarrow O_{2} \\ O+O_{3}\Rightarrow O_{2}+O_{2} \\ O_{3}+hv\Rightarrow O_{2}+O \\ \end{gather*}

This radical chain reaction is responsible for the screening of UV.