Wiki / PM-10

Particulate mass (dust) less than 10 micrometers (0.39 mil) in aerodynamic equivalent diameter.  (Aerodynamic equivalent diameter is the diameter of a unit density sphere having the same settling velocity as the particle in question, regardless of its shape and density.) Particulates of less than 10 microns are respirable and, therefore, constitute a health hazard, especially crystalline silica and lead dust.

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