Examinations of building materials for contaminations are usefull when the possibility exists, that the building fabric is contaminated by the former usage (for example contaminations with oils and paints) or by pollutants within the material (for example asbestos, PCB). The demand for examinations for building pollutants originates, when construction activities create waste, that has to be disposed correctly. Then oftenly matters of work protection have to be obeyed. Besides, building pollutants can affect negatively the usage of the building. Examples for this are contaminations with PCB, VOC and mold.