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How can urban pollution particles help make fog denser?

Answer and explanation

Correct answer: They provide condensation nuclei for water vapour

Correct answer: A. Water vapour does not usually form visible droplets spontaneously in perfectly clean air as easily as it does on tiny particles. Dust, smoke, and other fine pollution particles can act as condensation nuclei. When humid air cools to saturation, water vapour condenses on these nuclei and forms many small droplets. A is correct because a larger supply of suitable particles can support droplet formation and may make urban fog appear denser, especially when moisture and cooling are already present. B is wrong because these particles do not simply remove all water vapour; they help it condense. C is wrong because frost requires freezing conditions and deposition or freezing, not merely pollution. D is wrong because dense droplets and pollution scatter light and generally reduce visibility. Pollution alone cannot guarantee fog; sufficient moisture and cooling are still necessary. Memory cue: nuclei are tiny “seeds” on which droplets grow.

Related tags

Urban FogPollutionCondensation NucleiVisibilityForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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