Risk assessment tools related to transfers of gaseous pollutant from soil to indoor environments present large uncertainties relative to the knowledge of certain parameters, particularly those relating to the soil-building interface: considering the different basement typology, permeability level of floor. These uncertainties lead to an inaccurate evaluation of the impact of gaseous pollutants on indoor air quality.In order to contribute to the improvement of risk assessment models of gaseous pollutants from the soil, thiswork present in a fist part the development of analytical and numerical models. These models have been adapted to consider the different basement, in order to estimate the transfer of gaseous pollutants from the soil to the building. An analogy with heat transfer phenomena between soil and building is used to develop these models.They predict convective airflow transfers between soils and building, for different soil-building interface.There after, the analytical model has been incorporated into an airflow model. This model enables us to study the impact of different types of basement on the entry of pollutants from soil and the indoor air quality.Besides, experimental works have been made to complete the knowledge of concrete air permeability, because of a lack of data. Furthermore, the convective airflows from soil to building have been quantified experimentally.These airflows have been determined in the experimental house ‘MARIA’ installed in the CSTB. Suchquantification constitutes the first experimental database.Finally, the last part of this work shows a one-year follow-up study about the ability of natural SoilDepressurisation System. This study has been carried out to optimize the solutions of buildings protection from the soil gaseous pollutants.
