Ultrafine Particles: Ultrafine particles are smaller than 0.1 microns. By sheer number, about 90% of all airborne particles are this size. The primary source of ultrafine particles is combustion from motor vehicles, refineries, industrial plants and even cooking. Viruses are also ultrafine particles. The small size of ultrafine particles enables them to be easily inhaled, deposited into the lungs and absorbed into the blood. They have been linked to heart attacks, strokes, asthma and even cancer. Manufacturers of ordinary air filtration systems claim only that their systems filter particles larger than 0.3 microns. IQAir is different. IQAir’s HyperHEPA filtration is proven and certified to filter up to 99.5% of all particles down to 0.003 microns – the smallest particles that exist. Independent testing by laboratories and government agencies verifies the effectiveness of IQAir technology against ultrafine particles. When it comes to protection against ultrafine particulates, IQAir is the proven choice.   100x More Filtration Than Ordinary HEPA: Unlike other air purifiers, IQAir's HyperHEPA filtration system is proven to stop the smallest, most harmful particles in the air, all the way down to 0.003 microns – the smallest particles that exist. That includes viruses, pet dander, dust mites, air pollution and even cigarette smoke. IQAir uses nanofiber technology and innovative design to stop particles 100 times smaller than what other air purifiers claim. We don't just claim it, we prove it in rigorous independent testing.