Dust is more than just bits of dirt and sand from outside. In fact, any solid matter that is broken into small enough bits to be blown around becomes dust. Outside, common sources of dust are dirt, sand, pollen, and carcasses of deceased animals as well as worn down bits of trees. Dust is unavoidable because all solids slowly wear down. However, indoor dust can be minimized through a variety of techniques, including, having new windows… View More