Solid particles generated by handling, crushing, grinding, rapid impact, detonation, and decrepitation of organic or inorganic materials, such as rock, ore, metal, coal, wood and grain. Dusts do not tend to flocculate, except under electrostatic forces; they do not diffuse in air but settle under the influence of gravity.

Dusts are solid particles generated and dispersed into the air by, for example, handling, crushing and grinding of organic or inorganic materials such as rock, ore, metal, coal, wood and grain.

Formed when solid materials are broken into small particles.

Solid particles suspended in air generated by a mechanical process such as crushing, grinding, abrasion or blasting.

Fine particles produced by the breakdown of solid materials. (Aerosol suspensions of asbestos fibers are a typical example of a fibrous dust.)