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Which pollution problem results from a strong subsidence inversion?

  • A.The transport of pollutants across international boundaries over distances of many hundreds of kilometres
  • B.Accumulation of pollutants in a shallow surface layer
  • C.The rapid dispersal of pollutants through the whole depth of the troposphere by vigorous mixing above
  • D.The formation of acid rain

Answer: B

An inversion suppresses vertical mixing, so emissions are confined to a shallow layer and concentrations build up, which is the mechanism behind winter smog episodes in many cities. Los Angeles owes its photochemical smog largely to the persistent subsidence inversion of the subtropical high. Long range transport requires the opposite condition of vigorous mixing and strong flow.

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