startup-air filter VBolta Filter suggests electromagnetic air filter to improve air quality at homeBy Kim Boram SEOUL, July 23 (Yonhap) -- On days with high fine dust levels, many people will close all the windows and doors at home and turn on an air purifier. But experts point out the concentrations of indoor air pollutants increase when all the windows and doors are shut. Ventilation is the key to help remove or dilute indoor airborne pollutants coming from indoor sources, such as pet dander, cooking and other short-term activities.

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