The phenomenon of "Magic Dust" in housings

For several years, black staining that suddenly occurs in living space has been detected. This is usually so extensive and massive that the living qua lity is considerably diminished. Only in few cases the chemical constituent s of the black deposits contained typical combustion products such as polyc yclic aromatic hydrocarbons (PAH) and elementary carbon. Microscopic analys es and chemical analytics using GC/MS proved that the black deposits concer ned were usually dust fibers in connection with semi volatile organic compo unds (SVOC). The reasons for the occurrence of this dust phenomenon have no w been delimited but have not been cleared up entirely. Particularly buildi ng products used during renovation or completion have to be considered as p rimary sources of SVOC and fibers. As, however, the phenomenon appears near ly exclusively with the beginning of the heating period constructional cond itions and living behaviour must also be of importance.