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Why can a temperature inversion worsen air pollution in a valley?

Answer and explanation

Correct answer: A warm layer above cold surface air prevents vertical mixing

Correct answer: A. During an inversion, cold air remains close to the ground while a relatively warm layer lies above it. This arrangement is stable because the colder, denser air cannot easily rise through the warmer air. As a result, vertical convection and mixing are weakened. In a valley, smoke, vehicle exhaust, dust, and other pollutants released near the surface can therefore accumulate in the trapped cold layer instead of dispersing upward. B is wrong because warm air does not instantly destroy pollutants. C is wrong because inversion does not produce oxygen. D is wrong because rain usually removes some pollutants from the air by washing particles downward; it does not lift every pollutant upward. Memory cue: inversion acts like a lid over valley air.

Related tags

Temperature InversionAir PollutionValley ClimateAtmospheric StabilityVertical MixingDistribution Of Temperature And Inversion Of TemperatureSolar RadiationHeat BalanceAnd TemperatureSolar Radiation Heat Balance And Temperature

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