Discussion
Three of the following make a plume reach the ground close to the source. Which keeps it aloft?
Lofting
Building downwash
Stack tip downwash
Looping
Answer: A
Correct answer: Lofting
Lofting keeps the plume aloft: the stable layer beneath it blocks downward mixing while the unstable air above disperses it. Looping brings intermittent high concentrations to the ground near the stack, and both forms of downwash pull the plume down at the source.
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