The Probabilistic Aggregate Consumer Exposure Model (PACEM) has been developed for estimation of aggregate exposure to chemicals contained in multiple consumer products that are used in combination. The model has been developed by RIVMNational Institute for Public Health and the Environment , in cooperation with ETH Zürich and Radboud University of Nijmegen. The model is based on realistic product usage information obtained from surveys. Currently, information on the usage of personal care products and household products is included. The model is, at present, only operational at RIVM. Efforts are being made to make the tool available for the public.