[The measurement of fibre concentrations in lung dusts (author's transl)].

Measurements in ambient air have indicated, that air pollution contains fibrous dusts in various concentration. Moreover it seems to be necessary to get informations of the fiber content in the lungs of men. In this investigation 22 dusts, which were isolated by formamide-methode from lungs, were analysed. Methods of preparation and evaluation of the lung dust of people, which were occupational non-asbestos-exposed, are described. Fiber concentration per mg lung dust lies between 10 X 10(3) and 535 X 10(3). Most of the fibers were shorter than 10 mum. Because of the limitation of the evaluation-technique it was not possible to analyse the fibers with regard to their chemical composition.