How can gaseous pollutants be removed from air?
Gaseous pollutants can be removed from air by means of gas washing (removal of gas by dissolving it in a liquid), by adsorption on a solid or by converting it to other, less damaging gasses. Sometimes certain powders or granule solids can absorb an air pollutant. The air that needs to be purified is directed through an active carbon system or through metal oxides. The gasses can be freed again afterwards, by heating the absorbent. Some gasses can be destroyed through heating.
