Mention the components of photochemical smog and its effects.

(N/A) The common components of photochemical smog are ozone $(O_3)$,nitric oxide $(NO)$,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.
To control the formation of photochemical smog,we must control the primary precursors such as $NO_2$ and hydrocarbons. Catalytic converters are used in automobiles to prevent the release of nitrogen oxides and hydrocarbons into the atmosphere.
Certain plants,e.g.,$Pinus$,$Juniparus$,$Quercus$,$Pyrus$,and $Vitis$,can metabolize nitrogen oxides,and therefore,their plantation could help in reducing smog.