Mould exposure and its impact on human health are of interest to affected persons, public health departments, consumer advice centers, institutes for hygiene, specialists in environmental medicine, and physicians of other medical specialties dealing with indoor air problems. So far, scientifically based assessment of possible health risks of mould exposure is impossible in individual cases and often leads to more questions and uncertainties than to valid answers and solutions. Focusing on this subject, a workshop was carried out at the 5^th annual conference of the German Society of Hygiene, Environmental Medicine and Preventive Medicine held in Freiburg, Germany, in 2012 dealing with possible risks of olfactory effects and impairment of well-being to mould exposure. At this workshop, frequently asked questions were discussed and answered according to the actual scientific knowledge. The presented results of this workshop provide important information for affected people as well as experts for their daily work.