[Measurement of potential environmental carcinogens. II. Final determination methods]

As part of a general study of the biological activity of atmospheric micro constituants, we have perfected the methods for the rapid determination of polycyclic aromatic hydrocarbons. The method involves the use of two selective collectors, a high output rotatory freeze-drier, two-dimensional thin-layer chromatography and gas chromatography. A pollution map has been prepared of the Lyons areas showing the atmospheric concentrations of 13 polycyclic aromatic hydrocarbons and their variation with weather and sampling point.