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A plume is observed rising strongly and dispersing upward, with monitoring showing almost nothing at ground level for several kilometres.

What condition is this?

  • A.Fanning
  • B.Lofting
  • C.Fumigation
  • D.Trapping

Answer: B

Correct answer: Lofting

A plume that rises and disperses upward while almost nothing reaches the ground is lofting: a stable layer below blocks downward mixing, and unstable air above disperses it. It is the most favourable of the classical types, and typically occurs in the early evening.

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