“…These instrumental techniques are very sensitive, ensuring detection of very low concentrations and, in addition, may provide information on sample PAH content. The development of these methods or instruments is an encouraging sign and will inevitably lead Gammage et al, 1983 18 Schuresko, 1979 19 Gammage et al, 1977 18 Gammage et al, 1983 18 Gammage et al, 1983 18 Gammage et al, 1978 21 Gammage et al, 1978 22 Gammage and Bj^rseth 1980 23 to better control of air quality in occupational environments and, hence, exposure to toxics.…”