While the adverse health effects of PM2.5 and PM10 have been studied for many years, scientists agree the most harmful form of air pollution is ultrafine particles. Ultrafine particles are by definition smaller than 0.1 micron. By sheer number, they make up over 90% of all airborne particles. Because a particle that is 0.1 micron in size weighs 1,000,000 (one million!) times less than a 10 micron particle, ultrafine particles are grossly underrepresented in PM2.5 and PM10 measurements.
Because they are so tiny ultrafine particles can stay in the air for hours, are easily inhaled deep into our lungs and get absorbed into the bloodstream. From there ultrafine particles reach every organ and every cell in our body and disrupt their proper operation. Ultrafine particles have been linked to heart attacks, strokes, asthma and even cancer. An independent study conducted by the University of California, Riverside, demonstrated that the IQAir CleanZone SL is capable of 94% of ultrafine particles from the air in a large classroom.