The most important gaps in kno
wledge concern : 1) transfer and degradation processes (a better understanding and quantification of the fundamental transfer processes by which dioxins and PCBs move between the different environmental media and of the degradation processes occurring within these media is needed); 2) bio-accumulation and bio-magnification processes; 3) domestic incineration of wood (there is an information deficit concerning the amount and the composition of wooden
fuels used for room heating and cooking purposes); 4)
...[+++] reservoir sources (the contribution to human exposure, the behaviour and degradation processes and decontamination methods require examination); 5) open uses of PCBs; 6) carry-over rates and transfer factors for dioxins and PCBs from soil and feed to animal tissues and products (milk, eggs).