For the reconstruction of past exposures are often not available measures or, when available, they are inaccurate and do not cover the entire period of interest; the reliability of the measures is a crucial point because in a working environment the concentration of a pollutant is not uniform and is not constant in time. Starting from a suitable set of measures carried out in a given period inside an existing plant, it is possible to estimate past exposures by applying a simple model that takes into account three fundamental parameters: process productivity, protection and mitigation systems and technology in use. The proposed methodology has been applied to a case-study; in particular an industrial process for the production of carbon-based electrodes has been analyzed and the workers exposure to PAH has been considered. A good agreement between experimental measures and model predictions has been evidenced, thus confirming the feasibility and effectiveness of this methodology.
