How do mold spores get into a house or building?
Most, if not all, of indoor mold originates from outdoor sources. (source: AIHA) Some mold spores become airborne and move indoors along with air currents through open windows and doors. Spores that are not in the air can be tracked indoors on shoes, pets, shopping bags, and household items. Once spores enter, they can settle onto carpeting, draperies, furniture, countertops or other surfaces in the home. While it is not possible to keep spores out of your home, regular cleaning removes settled mold spores along with other settled dust particles. (source: NAHB) Efficient furnace filters can also capture airborne mold spores when air is drawn through the furnace or air conditioners.
