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Arrange these plume types in order from most favourable to least favourable for ground level concentration:

1. Lofting

2. Coning

3. Looping

4. Fumigation

Select the correct sequence.

  • A.2, 1, 3, 4
  • B.1, 3, 2, 4
  • C.2, 3, 1, 4
  • D.1, 2, 3, 4

Answer: D

Lofting keeps the plume entirely aloft, coning disperses it evenly, looping brings intermittent peaks to the surface, and fumigation delivers the whole accumulated plume at once. The order follows the stability profile directly.

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