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Concern about indoor exposure to mould has been increasing as the public becomes aware that exposure to mould can cause a variety of health effects and symptoms, including allergic reactions.

Moulds can be found almost anywhere; they can grow on virtually any organic substance, as long moisture and oxygen are present. There are moulds that can grow on wood, paper, carpet, foods, and insulation. When excessive moisture accumulates in buildings or on building materials, mold growth will often occur, particularly if the moisture problem remains undiscovered or unaddressed. Air conditioning system provide an excellent environment for mould growth. The cooling coil, which cools the air to be distributed, has moisture (condensation), a cool temperature and dust particles for food. All air passes throught this coil and in many cases over bacteria and mould. It is impossible to eliminate all moulds and mould spores in the indoor environment. However, mould growth can be controlled indoors by controlling moisture indoors and by the application of biocides on air conditioning coils.

Moulds reproduce by making spores that usually cannot be seen without magnification. Mould spores waft through the indoor and outdoor air continually. When mould spores land on a damp spot indoors, they may begin growing and digesting whatever they are growing on in order to survive.

There are many types of moulds. All moulds have the potential to cause health effects. Moulds can produce allergens that can trigger allergic reactions or even asthma attacks in people allergic to mould. Others are known to produce potent toxins and / or irritants. Potential health concerns are an important reason to prevent mould growth and to remediate / clean up any existing indoor mould growth.

Potential health effects and symptoms associated with mould exposures include allergic reactions, asthma, and other respiratory complaints.
There is no practical way to eliminate all mould and mould spores in the indoor environment; the way is to control mould growth.
Prevent condensation: Reduce the potential for condensation on cold surfaces by adding insulation.
Moulds can be found almost anywhere; they can grow on virtually any substance, providing moisture is present. There are moulds that can grow on wood, paper, carpet, and foods.
In areas where moisture is always present the use of biocides will control bacterial and mould. (air conditioning coils)

Indoor Fungi Resources
University of Minnesota - Enviornmental Health and Safety