Several activities can cause unpleasant odours: waste storage and treatment, refinery, animal breeding, slaughterhouse, sewage treatment plant, pulp mill, fertilizer plant… Even if these unpleasant odours very rarely have toxic effects, they have an impact on the image of the emitting activity, the quality of life and, to a larger extent, on the functioning of the territory. It is this last observation, and the population's growing demand for the quality of its living environment that has led decision-makers and industrialists to address the problem of odour emissions. Until now, there is no standard method for assessing odour nuisance on a territory. Several methods exist and their use depends on the objectives and resources of the stakeholders. Few models have been developed to predict odour nuisance on a territory. The purpose of this article is to explain the interest of predictive methods in the evaluation of odour nuisance on a territory. For this purpose, this article presents an example of a method that anticipates and maps the levels of odour nuisance on a territory and the economic consequences that it causes. Based on a risk analysis method, the model uses AHP method, a multi-criteria approach, to assess the effect (nuisance) of the exposure on receptors. (Popa 2013). This method provides a paradigm shift from a posteriori measurement of odour nuisance to a preventive approach used as a decision support tool.