Discussion
Statement I: Fumigation produces brief but severe ground level concentrations.
Statement II: A breaking inversion mixes an elevated plume rapidly down to the surface.
In the light of the above statements, choose the correct answer.
Answer: C
Correct answer: Both Statement I and Statement II are correct
Both statements are correct, and the second describes the mechanism of the first. When a nocturnal inversion breaks up, the growing unstable layer reaches a plume that has been travelling in the stable air above and mixes it rapidly down to the surface.
The episode is brief - typically half an hour to an hour, until the mixed layer has deepened well beyond the plume - but severe, because material that accumulated in a thin ribbon overnight arrives at the ground almost at once. Fumigation is the reason short-averaging-time standards can be breached at sites that comply comfortably on a daily mean.
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