Discussion
The maximum ground level concentration occurs at \( 1.2 \) km with an effective height of \( 90 \) m. Raising the effective height to \( 135 \) m moves it, other things equal, to roughly
Answer: A
Correct answer: A greater distance downwind
A plume released higher must spread further vertically before its edge reaches the ground, and the vertical dispersion coefficient grows with distance - so the point of maximum ground-level concentration moves further downwind, and the maximum itself is lower.
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