[Exposure science: the need to articulate the data related to hazards, to the worker and to his activity]

To optimise the prevention of occupational risks, it seems necessary to revise existing methodological approaches by organizing and better articulating the data concerning hazards, the worker and, his activity. In the context of occupational health, exposure science offers the opportunity to regroup and link knowledge and know-how in order to fully characterise hazardous occupational exposure. The authors illustrate the interest of this approach using the example of a field study on the characterisation of occupational exposures to polycyclic aromatic hydrocarbons.