According to the Environmental Protection Agency (EPA), indoor air may be four to five times more polluted than outdoor air. With Americans spending nearly 90 percent of their time inside, indoor air quality is often taken for granted. Allergens such as pollen, animal dander, dust mites, cockroaches and mold; irritants such as smoke, chemical odors and dust; and biological pollutants ... http://49000.kr/shop/list.php?ca_id=20