A micron is one-millionth of a meter. Without magnification, the trained human eye can see contaminants that are approximately 50 microns in size. The Atmosphere Mini Air Treatment System removes particulates as small as 0.0024 microns from air passing through the unit. One grain of pollen is 30 microns, dust mite byproducts are 10 microns, viruses can be as small as 0.02 microns. Ambient air pollution, with high concentrations of small and fine particulate matter (pollution particles smaller than 2.5 microns) is recognized as the single greatest environmental health risk we all face. Fine PM indoors originates mostly from outdoor air and indoor combustion of solid fuels for cooking and heating. Amway scientists designed the Atmosphere Mini Air Treatment System to remove more microscopic particles, because these pollutants tend to remain suspended longer in the air we breathe.