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From where does ozone come in the photoc...

From where does ozone come in the photochemical smog ?

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In the presence of sunlight, `NO_(2)` present in the air undergoes photolysis to form NO and atomic oxygen (O). The atomic oxygen then combines with moleculer oxygen `(O_(2_))` to form ozone
`NO_(2)(g)overset(hv)(to)NO(g)+O(g)`
`O_(2)(g)+O(g)rightarrowO_(3)(g)`
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