We developed an air cleaner (AC) for chemical sensitivity (CS) patients. The AC have a high efficiencyair filter and a special activated carbon filter to remove airborne particles and gaseous contaminants.Using the AC, we conducted a monitoring experiment to investigate improvement of indoor air quality(IAQ) in the actual residences of CS patients. In the experiment, IAQ in the residences of nine CSpatients was measured before and after AC operation.
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