What are the harmful effects of photochemical smog and how can they be controlled?

(N/A) The common components of photochemical smog are ozone,nitric oxide,acrolein,formaldehyde,and peroxyacetyl nitrate $(PAN)$.
Photochemical smog causes serious health problems. Both ozone and $PAN$ act as powerful eye irritants.
Ozone and nitric oxide irritate the nose and throat,and their high concentration causes headache,chest pain,dryness of the throat,cough,and difficulty in breathing.
Photochemical smog leads to the cracking of rubber and extensive damage to plant life. It also causes corrosion of metals,stones,building materials,and painted surfaces.
Many techniques are used to control the formation of photochemical smog:
$1$. If we control the primary precursors of photochemical smog,such as $NO_2$ and hydrocarbons,the secondary precursors such as ozone and $PAN$ will automatically be reduced.
$2$. Catalytic converters are used in automobiles,which prevent the release of nitrogen oxides and hydrocarbons into the atmosphere.
$3$. Certain plants,e.g.,$Pinus$,$Juniparus$,$Quercus$,$Pyrus$,and $Vitis$,can metabolize nitrogen oxides; therefore,their plantation could help in this matter.