Discussion
The mixing height is
Answer: B
Correct answer: The depth through which pollutants disperse
The mixing height is the depth of the layer through which pollutants released near the surface are readily dispersed by turbulence. It is bounded above by a stable layer or inversion that acts as a lid, and it varies through the day, being shallow at night and deepening as surface heating drives convection.
It is the volume available for dilution, which is why a low mixing height and light winds together produce high concentrations. It has nothing to do with the anemometer height, the tallest stack on the site, or the tropopause, which lies far above the layer in which surface pollution disperses.
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