Particle characterization is an environmental laboratory test that identifies contents of dust. For example, 40% of the dust samples collected from the air or from a surface may show as being “biologicals, such as organic debris, skin, starch”. Opaque particles are also shown as a percentage. This group includes submicron carbonaceous materials and ambiguous particulates. Cellulose (cotton and paper) is also shown, as are minerals.
This is a particle of soot seen during particle characterization done in an office environment. This analysis was done because of a recent fire in the area. This soot particle.
This aluminum particle came from dust sampled in a manufacturing plant.