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What can be the role of tiny dust and smoke particles in urban fog?

Answer and explanation

Correct answer: They help droplet formation by providing condensation nuclei

Correct answer: A. Tiny dust, smoke, and other suspended particles can act as condensation nuclei. These particles provide surfaces on which water vapour can begin to condense when moist air cools to saturation. The resulting small droplets remain suspended and contribute to fog. In cities, pollution particles may therefore help fog develop or become denser, although moisture and suitable cooling are still necessary; particles alone do not guarantee fog. B and C are wrong because such particles do not remove all water vapour or make air completely dry. D is the opposite of the usual effect: more suspended particles and droplets generally scatter light and reduce visibility. Memory cue: nuclei are “seeds” for droplets, not moisture destroyers. Also distinguish fog droplets from the particles themselves: particles help condensation, while droplets cause the visible fog.

Related tags

Urban FogCondensation NucleiPollutionVisibilityForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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