Discussion
Which stability class gives the most persistent air quality problems?
Answer: D
Light winds with a strong inversion give minimal dilution in both the vertical and the horizontal, so concentrations from ground level sources such as traffic build up over many hours. Winter anticyclonic episodes combine both conditions. Unstable classes give high but brief peaks rather than the sustained accumulation that damages health. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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