Answer:
The oxidation of sulphur dioxide
into sulphur trioxide can occur both photo chemically or non-photo chemically.
In the near ultraviolet region, the \[S{{O}_{2}}\]
molecules react with ozone photo chemically.
\[S{{O}_{2}}+{{O}_{3}}\xrightarrow{hv}S{{O}_{3}}+{{O}_{2}}\]
\[2S{{O}_{2}}+{{O}_{2}}\xrightarrow{hv}2S{{O}_{3}}\]
Non-photo chemically,\[S{{O}_{2}}\] may
be oxidised by molecular oxygen in presence of dust and soot particles.
\[2S{{O}_{2}}+{{O}_{2}}\xrightarrow{Particles}2S{{O}_{3}}\]
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