HYGA 4.0 TABLETOP SYSTEM As established by the United States EPA in the last several years a growing body of scientific evidence has indicated that the air within homes and other buildings can be more seriously polluted than the outdoor air in even the largest and most industrialized cities. Other research indicates that people spend approximately 90 percent of their time indoors. Thus for many people the risks to health may be greater due to exposure to air pollution indoors than outdoors. To help create a healthier indoor environment use the Germ Guardian Hygia 4.0 Table Top. The Hygia 4.0 offers four stages of air filtration that helps purify the air. It is the perfect air purifier for the home or office. Small and compact it is great to have on your desk or nightstand to help create a healthier indoor environment. The HEPA filter captures 99.9 percent of airborne particles such as household dust pet dander mold spores and plant pollens. Helps to remove smoke and odors from the air. Optional speed settings allow for quiet operation when run on low.