In the absence of specific pollutant sources, carbon dioxide is used simply to indicate the adequacy of outside air supply. We are fortunate at UCSC that the campus' No Smoking policy helps to eliminate ETS as a problem and radon gas has not been identified as an area of concern in campus buildings. Biological Contamination Bioaerosols are particles of biological origin including fungi, bacteria, viruses, algae, amoebae, pollen grains, and the dead particles they produce. They may also include parts of plants, insects, animals and their wastes such as saliva, urine, feces, and dander. Exposure to bioaerosols may cause some individuals to develop allergies, sensitization, or disease.
Microorganisms are always present in indoor environments.
It is the excess quantity of microbes that generate concern. IAQ problems are rarely caused by biological contaminants unless a combination of four conditions exist. There must be a source of nourishment such as organic debris settled or suspended in the reservoir. There must be a mechanism for disseminating or dispersing the biological material. The campus community generates a substantial number of IAQ complaints.