There are more pollutants inside a home than there are outside.It is a common misconception that indoor air is much safer to breathe. However, because the air inside a house or office does not circulate as freely and widely as it does outdoors, dust and spores are more likely to stay trapped.Breathe a sigh of relief (and breathe better) with the BLACK+DECKER Tabletop Air Purifier! You deserve cleaner air in your home and your work environment. Our tabletop air purifier is designed with a 3-stage filtration system. Combined, these filters rid the air of 99.97% of micro particles. Pre-Filter – Traps dust, pet hair, and other irritants HEPA Filter – Removes micro particles like pollen, dander, and dust mites. Activated Carbon Filter. Minimizes odors, such as cigarette smoke and the aroma of food being cooked.