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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 presence of sunlight, `NO_2` present in the air undergoes photolysis to form NO and atomic oxygen. The atomic oxygen then combines with the molecular oxygen to form ozone
`NO_2 overset"hv"to NO+(O), O+O_2 to O_3`
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