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How can urban pollution particles help in dense fog formation?

Answer and explanation

Correct answer: They provide condensation nuclei

Correct answer: A. Water vapour does not always form droplets equally easily in completely particle-free air. Tiny particles such as dust, smoke, soot, and some pollution aerosols can act as condensation nuclei. Water molecules gather on these surfaces, making it easier for small liquid droplets to form when moist air cools to saturation. In a city, many such particles may be present, and the resulting droplets can contribute to dense fog and severe visibility reduction. B is wrong because pollution particles do not remove all moisture; they can help moisture condense. C is wrong because the particles themselves do not make air completely dry. D is wrong because dense fog normally reduces visibility rather than increasing it. The particles are not the only condition: adequate moisture, cooling, and near-saturation are also required. Memory cue: nuclei are tiny “starting surfaces” for droplets. Pollution can support droplet formation, although it is harmful and does not by itself guarantee fog.

Related tags

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

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