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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, ultra violet rays convert `NO_2` present in air to NO and atomic oxygen. Some of the oxygen atoms combine with `O_2` in the air to form ozone.
` NO_2 underset("radiation")overset("u.v")to NO+O`
`O_2 + O to O_3`
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