In Europe, an estimated 10-15% (depending on the country) of the indoor environments where human beings live, work and play are damp. Too much moisture makes a home stuffy and gives it a faint odor. Humid walls create a coldness that makes more heating necessary and increases energy bills.

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WHO is concerned about this situation because excessive dampness and mould are a threat t health. Occupants of damp or mouldy buildings are at increased risk of experiencing health problems such as respiratory symptoms, respiratory infections, allergic rhinitis and asthma. Some people are more sensitive to mold than others and some groups are especially vulnerable. Additional effort should be made to keep away from damp and mould babies and children, elderly people, those with existing skin problems, such as eczema or respiratory problems, such as allergies and asthma and anyone who is immune-compromised (e.g., Chemotherapy patients).