International audienceThis paper presents the methodologies used to assess environmental exposure to air pesticides. It relies on a literature review conducted on the basis of articles published in epidemiology and human science journals, concerning environmental exposure in North America, Europe and Australia.The first part of the paper presents direct assessment methods (pesticides concentrations in air, house dust or biological matrices) and indirect methods (estimates indicators based on agricultural land-use, type of crops, applied pesticide and auto-declaration of pesticide use). These two types of methods are mainly oriented towards an assessment of exposure at place of residence. Secondly the explanations of the spatial variability ...