RENPHO AP-088 Air Purifier adopts 5-stage filtration (pre-filter, H13 true HEPA filter with coating, activated carbon filter, and net filter), which can effectively remove 99.97% of particulates as small as 0.3 microns, such as allergens, pollen, dust, odors, smoke, mold, pet dander, VOCs, etc. After using RENPHO AP-088 Air Purifiers, the air is much fresher and the allergic symptoms are significantly improved. Ideal for allergy sufferers, pet owners, and smokers!