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Molds are microorganisms naturally present in indoor and ambient air. Depending on the type of mold identified and the concentrations in the air, they can affect health such as irritation, asthma, allergies. Mold growth can be seen on the walls or ceilings of a building with spots and staining: this is usually the presence of moisture.

Mold is also a pollutant of the air present in the ductwork. Molds are dispersed in indoor air resulting in a degradation of the quality of indoor air in offices or production areas. An audit of the quality of the air by a mold expert can identify the sources of degradation and thereby provide an improvement in the health and well-being of employees, but also in quality.