[en] Naturally occurring isotopic systems, like those for strontium (Sr) and lead (Pb ), are very useful for characterizing different sources of pollution and to define/verify the pathways of their transport from source to receptor. Measures taken to reduce the emission of pollutants can be monitored, and it is possible to produce a background information on the present and past levels of Pb in man, in the environment and in various geographical regions, and to elucidate living habits in historic and modern times. The stable isotopic systems of Pb and Sr each give much valuable information, but the combination of the two techniques is a very powerful tool in environmental, nutrition and archaeological research. Still more information may be obtained by the combination with the light stable isotope systems in problems concerning eutrophication, fertilization, mine drainage, deterioration of the cultural heritage etc