In today's indoor environments, pollution levels often exceed those in outdoor air. Medical studies report that our respiratory system may have to eliminate up to two heaping tablespoons of particulates every day. Dust, pollens, mold spores, pet dander, carpet lint, and dust mite feces are some of the pollutants we inhale. Breathing air bourne pollutants often trigger allergy, asthma, and hay fever symptoms. Quality Comfort recommends a great product by Dust Free®. These air filters are Doctor recommended, easy to maintain, and has a lifetime warranty!