How moisture contributes to IAQ problems?
Many IAQ problems begin with moisture problems: rain leaks, floods, or excessive humidity. When this occurs, explosive growth of dust mite, mold, bacteria, and other micro-organisms can occur. Many people are allergic to dust mites and mold. Some molds and bacteria are toxigenic (capable of being poisonous). Rarely, molds and bacteria growing in the environment can also be infectious. While it is normal for such things to exist in the environment, under excess moisture conditions the levels can become extremely high inside a building. In order to prevent growth of microorganisms in large numbers, water problems need to be dealt with rapidly. One study demonstrated that if porous materials (such as carpeting, wallboard, or ceiling tiles) get wet and remain wet for more than 3 days, the chances of mold growth are nearly 100%.
