The recent Inserm collective review highlights the presumption of a link between prolonged exposure to pesticides and the development of certain diseases. Understanding exposure patterns throughout a worker’s career is therefore essential for occupational health monitoring. However, few individuals are able to recall their exposure to these products (more than 1,000). On the other hand, they can more easily recall the crops they worked on. To help occupational physicians reconstruct these exposures, the Occupational Health Department of the InVS has conducted a historical survey of the approved uses in France of each active substance by year and crop, and makes this work available through the CIA tool (Compilation of Acta Indexes). Data on authorized uses available in the Acta Indexes since 1961 have been entered into a database. These indexes can be compared to the Vidal dictionaries for medications. The CIA tool provides this relevant data in the form of: 1,000 records (one per substance) containing data on: chemical family, uses by year, certain characteristics (solubility, toxicity...), changes in formulation... ; an Access® database enabling multi-criteria queries via a simple user interface: lists of substances by crop, by year, by chemical family... This tool, distributed free of charge, is the first of its kind. It will be updated annually. It improves the estimation of exposure among current agricultural professionals as well as those who may have worked in the sector several years ago, for whom traceability is even more complex. (R.A.)