Meets the American Lung Association's Health House Project indoor air quality guidelines. Outperforms all competitors' 3 month, 1 filters. Captures: airborne micro particles, including smoke; airborne allergens, including pollen, pet dander, mold and bacteria; large particles like dust and lint. No unnecessary antimicrobial chemicals added. Filtrete filtering material will not support the growth of bacteria, mold, mildew or fungi in normal use.