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Carbon Adsorption
Carbon adsorption is used primarily for removal of gases and vapours. It is effective against volatile organic compounds (VOCs) but is not used for control of airborne dust or microorganisms. It is, in fact, not advisable to use carbon adsorption where particulate matter is present and may clog the adsorbent bed.

Carbon adsorption depends on the use of materials like activated charcoal which possess an enormous amount of surface area per unit mass. The presence of this surface area allows gas molecules to adhere to the surface.