Discussion
Match each plume type in List I with its ground level effect in List II.
List I
A. Lofting
B. Fumigation
C. Looping
D. Fanning
List II
1. Intermittent high peaks close to the stack
2. Almost nothing reaches the ground
3. Very little nearby, but a risk far downwind
4. The whole accumulated plume arrives at once
Select the correct match.
Answer: B
Correct answer: A-2, B-4, C-1, D-3
Lofting keeps almost everything aloft (2). Fumigation brings the whole accumulated plume down at once as the inversion erodes (4). Looping gives intermittent high peaks close to the stack, as the plume is thrown up and down by large eddies (1). Fanning gives very little nearby but carries an undiluted plume far downwind (3).
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