Let's put this into perspective. If we took 0.1 cubic feet of air, a representative particle count would be:
. 27,000 particles at the 0.007 - 0.5 micron level
. 4,500 particles at the 0.5-1.0 micron level
. 500 particles at the 1.5 micron level
. 20 particles at the 5-10 micron level
. A few at the 10-25 micron level
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