Discussion
The maximum ground level concentration from an elevated source occurs
Answer: D
Correct answer: At a finite distance downwind
The maximum ground level concentration from an elevated source occurs some distance downwind, not at the stack. The plume leaves at an effective height \( H \) and must first grow vertically before any of it reaches the surface, so the ground level concentration rises from nearly zero, peaks where the vertical spread \( \sigma_z \) has become comparable with \( H \), and then falls again as continued dilution takes over.
The distance to the peak depends on stability: it is close to the stack in unstable conditions, when the plume grows quickly, and far downwind in stable conditions. Directly beneath the stack the concentration is very low.
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