"Under current European and national legislation, biocidal products must be registered based on a risk assessment with respect to humans, animals and the environment. Knowledge gaps, particularly in the area of human exposure assessment, make it very difficult to adequately assess the potential for exposure and thereby health risks for many biocidal use scenario's. A European-funded project has tackled this issue and ways are described to deal with the problem in an appropriate fashion. The approach is accepted by the European Commission for the Biocidal Product Directive as a TnG (Technical notes for Guidance). In the present paper only worker exposure will be considered. Problems and possible solutions with using the TnG in practice will be discussed."

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