Answer:
Sunlight causes photochemical
decomposition of \[N{{O}_{2}}\] into NO and O.
\[N{{O}_{2}}+hv\to NO+O\]
Atomic oxygen is a highly reactive
species. It combines with diatomic oxygen and forms ozone.
\[{{O}_{2}}+O+M\to
{{O}_{3}}+M\]
Where M is inert gas such as
nitrogen.
Thus, \[{{O}_{3}}\] is formed
during the formation of smog.
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