Indoor Mold Allergy Information

Molds found indoors come from the outdoors. It is possible to see relatively high levels of molds inside if they are high outside. Any house can develop a mold problem given the right conditions. Certain molds, such as Aspergillus and Penicillium are more commonly found indoors. You might not see it growing on the walls, but it may still be present in your home.

Molds require two factors to grow indoors: (1) free moisture from condensation, leakage from pipes or foundations, or any ongoing source of water; and (2) something to grow on that provides them a food source. Molds particularly like to grow on wallboard, damp wood, fabrics, leather, and paper products. They can also grow on concrete or the dirt on windows or window frames. Food products, particularly vegetables, fruits, and breads provide a good place for mold to grow.

Molds spread by producing spores that can become airborne when they are disturbed directly or by air currents. These spores end up on surfaces where they grow. Dust from mold-contaminated houses can cause allergy symptoms if a person who is allergic to the mold inhales them. Some molds produce bad odors. These odors may be irritating (like any strong odors) without actually causing an allergic response.