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International audienceA new approach of assessing the risks inherent in the implementation of powders, including nanomaterials has been developed. This tool is based on the method of the OHB (Occupational Hazard Band) widely spread in the chemical industry. The European classification and CLP scales of toxicity have not been modified; only the control of exposure has been worked at. The method applies essentially to the prevention of the exposures by airborne materials, whatever their particle size. The skin exposure is not treated there specifically for the time being. The method considers exposure based on seven parameters to take into account the characteristics of the materials used, their emission potential, the conditions of use, as well as classic parameters of the characterization of the exposure as the duration and the frequency. The method stresses on a pragmatic exploitation of the current knowledge and of the available data, bearing in mind that a lot of them are not easily accessible to plant operators. The product of the reflection is then positioned on a hazard x exposure matrix from which 3 levels of priority of action are defined, as in the classical OHB method applied to pure chemical risk. This approach fills in a gap in term of risk assessment and avoids jeopardizing all that had been set up for years, while introducing newelements of reflection accessible to all operators

Risk assessment method for the implementation of materials divided up to the nanometric scale