Here is the number that matters: a thin carbon mat weighing 150-200g, which is what you find in most sub-$400 HEPA + carbon air purifiers, has a finite adsorption capacity measured in grams of pollutant
Anyway, yeah, I remember it, sort of
I took the photograph close up so it focused on her and blurred out the background
For cigarette smoke specifically, its role is narrower
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They sponsored events, they work with black leaders the tobacco industry has been very cunning in getting support of the black community, says Brown