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Those air polluting bouts colloquially referred to as the "black cloud" occur during the fall season when the wind decreases and thermal inversions occur more frequently; the warm air holds down the cold air, preventing pollutants from rising and scattering.
I reported on the effectiveness of the 450 wind machines now in use in Ontario, and on the measurement of thermal inversions and response times for protecting vines.
This has the effect of creating a micro-climate effect that leads to phenomena such as thermal inversions.