Sediment.
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A simple method is filtering of air; the filter remain dirty.
I think the commercial advantage is that when settling, the particles settle to the bottom but filtering removes unwanted particles.. For example, people don't want to drink water with unhealthy particles in them, so they filter the water..
"Without the air filter, the increased dust in the air would trigger my allergies." "Intelligence agencies must filter the information they collect to find what is useful."
Magnifying glass and tweezers is the only simple way I can think of. There might be some way of doing it by density or size. You could use an experiment.