Blueair 203/303 Particle filter is the ideal choice for allergy sufferers and other health-conscious individuals that need high-efficiency particle removal. The unit contains one polypropylene 3-stage progressive filter that contains millions of ultra-thin fibers with each state trapping progessively smaller harmful particles as they pass through the pleats. The Blueair 3-stage progressive filter effectively removes every type of particulate air pollutants, including allergens, pollen, mold spores, dust, pet dander, bacteria, and viruses.
