kogum väikestest tahketest osakestest tüüpilise läbimõõduga 1-100 mikromeetrit, mis tekib looduslike jõudude või inimtegevuse tagajärjel
small, dry, solid particles projected into the air by natural forces, such as wind, volcanic eruption and by mechanical or man-made processes such as crushing, grinding, milling, drilling, demolition, shoveling, conveying, screening, bagging and sweeping. Dust particles are usually in the size range from about 1−100 μm in diameter and they settle slowly under the influence of gravity
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