First snow isnt really airborne and does stick to itself pretty well. Dust simply gets blown off when there is a strong enough wind.
Second it might simply be a matter of not having enough dust around. If you’ve ever been to a really dusty environment like a steel plant you would have seen layers of dust in some crevices were nobody ever looks.
Like someone said, dust is usually disturbed before it does pile up. Years ago I was underneath a steel plant’s blast furnace – this wild deep foundation pit where everything was made out of bricks – and found dust layers that were over an inch deep on some surfaces. I remember finding some dust graffiti that dated itself, somewhere around 10 years old at that time since someone had stood where I did.
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