Discussion
An emission of \( 120 \) g/s disperses into a ventilation volume characterised by a coefficient of \( 4000 \) m\(^2\)/s over a city \( 20 \) km across. The mean concentration is roughly
Answer: A
The air throughput is \( 4000 \times 20000 = 8\times10^7 \) cubic metres a second, so \( 120/8\times10^7 = 1.5\times10^{-6} \) g/m\(^3\). Box models of this kind give a useful order of magnitude before any detailed calculation.
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