Discussion
Which phenomenon results from stability trapping in a valley?
Answer: C
Cold air drains into the valley and is trapped beneath the inversion, so the effective mixing depth is even smaller than over flat terrain and pollutants accumulate for days. Alpine valleys and Mexico City suffer for exactly this reason. Foehn events can flush the pool out, which is one of the few natural clearance mechanisms available. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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