Correct statements about oxidising smog are
I.
\[
\text{Primary precursors of it are } O_3,\ PAN
\]
II.
It occurs in warm, dry and sunny climate
III.
Its formation can be controlled by the use of catalytic converters in automobiles
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Photochemical (oxidising) smog:
\[
\text{Primary pollutants}
=
NO_x + \text{Hydrocarbons}
\]
\[
\text{Secondary pollutants}
=
O_3,\ PAN,\ Aldehydes
\]
It is commonly called Los Angeles smog and forms on sunny days.