These include fungi, molds and mildews, pollen, animal dander, and dust mites. These are found in moist walls, ceilings, carpets, and furniture; poorly maintained humidifiers, dehumidifiers, and air conditioners; bedding; pets. These contaminants tend to collect on wall-to-wall carpeting, fabrics, and upholstered furniture. They cause eye, nose and throat irritation; shortness of breath; dizziness; fatigue; fever; asthma. (Marinelli and Bierman-Lytle, 1995, p.245)
1) Living organisms, such as viruses, bacteria, or mold (fungi), 2) the remains of living organisms, or 3) debris from or pieces of dead organisms. Biological contaminants can be small enough to be inhaled, and may cause many types of health effects including allergic reactions and respiratory disorders.