Mold Molds are small fungi which live on plant or animal matter. Molds are one of the most widespread living organisms, with tens of thousands of different varieties. The common bread mold is a well-known example.
Many molds reproduce by releasing spores into the air that grow into new mold clusters.
These airborne mold spores can produce allergy symptoms. Avoid exposure to mold in damp places such as wooded areas, barns, basements and saunas. Wear a face mask if you can't avoid moldy places. Keep humidity below 35 percent with air conditioners, dehumidifiers, and fans. Use products that contain mold killing solutions or a bleach solution to clean areas of high mold growth.