Emissions are the discharges of substances into the air which can be hazardous to health, generate an explosive atmosphere and be harmful to the environment. Emissions can be in the following forms.
Dusts — solid particles predominantly larger than colloids, and capable of temporary suspension in air. They include a diverse array of materials arising as by-products from mining, construction/demolition and refining/manufacturing/processing.
Fumes — airborne fine solid particulates formed from the gaseous state usually by vapourisation or oxidation of metals, eg welding fume.
Mists — airborne liquid droplets, eg oil mist.
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