Discussion
Which meteorological condition disperses urban pollution most effectively?
Answer: B
Vertical mixing through a deep layer combined with horizontal ventilation gives the greatest dilution, which is why air quality is best in unsettled windy weather. Anticyclonic conditions with subsidence and light winds are precisely the worst case. This inverse relationship between pleasant weather and good air quality is a recurring public communication difficulty. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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