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A dust particle visible to the human eye has a size of 500 micrometers = 0,5 mm.
In contrast, a fine dust particle that is no longer visible to us is smaller than 10 micrometers = 0,01 mm.
And the finer these particles are, the easier and deeper an absorption via the respiratory tract into the blood circulation can take place, thus also into the organs.
It is also called overcoming the blood-air barrier.