4-stage filtration (Pre-filter, Antibacterial Coating, True HEPA Filter, High-Efficiency Activated Carbon Filter, and Net Filter) can effectively capture 99.97% of particulates as small as 0.3 micros such as allergens, pet odor, hair, dander, smoke, cooking fumes, mold, and large dust particles. This air purifier can improve indoor air quality, freshen air at home, and help you breathe better.