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Trapping occurs when a plume is released

  • A.Into neutral conditions
  • B.Into strongly unstable air
  • C.Between two inversions
  • D.Above an elevated inversion

Answer: C

Correct answer: Between two inversions

In trapping the plume is confined between a stable layer below and another above. It can escape in neither direction, so the material accumulates in the layer between them and concentrations build steadily for as long as the two inversions persist.

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