Answer:
Photochemical smog is an example of secondary pollutants, it is formed in traffic congested metropolitan cities where warm conditions and intense solar radiations are present. It is mainly composed of ozone\[({{O}_{3}})\] and peroxy acyi nitrate (PAN) and\[N{{O}_{X}}\]. (x=2, 3)
Effect on biological world: Smog damages plant as well as animal life. In plants, main damage is caused to leaves. Ozone activates lung disease in humans and also corrodes the heritage buildings. In human, PAN causes irritation of eyes.
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