classical smog is also called reducing smog.

common components of classical smog are $\mathrm{O}_3, \mathrm{NO}, \mathrm{HCHO}$.

photochemical smog leads to cracking of rubber and corrosion of metals.

photochemical smog occurs in warm, dry and sunny climate.

It is controlled by the use of catalytic converters in automobiles.

It causes corrosion of metals.

It is a mixture of $\mathrm{SO}_2$, smoke and fog.

It causes extensive damage to plant life.

$\mathrm{SO}_4^{2-}$

$\mathrm{NO}_3^{-}$

$\mathrm{F}^{-}$

Pb

A-IV, B-III, C-II, D-I

A-IV, B-III, C-I, D-II

A-III, B-IV, C-I, D-II

A-II, B-III, C-IV, D-I