In area or seasons of lesser solar radiation, smog formation is incomplete and the air is referred to as:

Brown air

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Grey air

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Yellow air

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Colourless air

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Solution

The correct option is B Grey air
Photochemical exhaust cloud is made basically out of ozone (0) peroxyacetyl nitrate (PAN) and NO. It is frequently called brown air where sun-powered radiation is serious. In territories or periods of lesser sun based radiation, brown haze arrangement is fragmented and the air is alluded to as grey air.
So, the correct option is 'Grey air'.

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