Discussion
Ground level concentration on the centreline is \( C = Q/(\pi u \sigma_y \sigma_z) \times \exp(-H^2/2\sigma_z^2) \). With \( Q = 80 \) g/s, \( u = 4 \) m/s and the values above, the concentration is about
Answer: A
The leading term is \( 80/(4 \times 42412) = 4.72\times10^{-4} \) g/m\(^3\), and multiplying by 0.607 gives \( 2.86\times10^{-4} \) g/m\(^3\), or 286 micrograms. Note that the reflection term would raise this further once the plume is well established at the surface.
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