Therefore, to briefly describe the context associated with the research work carried out in Québec, the first section presents the main characteristics of ozone as well as the conditions that favour its formation; the second section explains its short- and long-term health effects; and the third section addresses such things as ambient concentrations and the spatial and temporal distribution of gr [...] The formation of ozone and its compounds is complex and depends on numerous factors such as the intensity and distribution of sun rays, the concentrations of precursor pollutants in the ambient air, as well as the rates of chemical reactions and other atmospheric processes (U. [...] The highest concentrations are generally found in the south of the province, due to the significant movements of air masses coming from the south and southwest. [...] In a 50-km radius around the measuring stations, the concentration was estimated using the following relationship: Wij=rij-3, where Wij was the weighting factor of the concentration at measuring station j for region i, and rij was the distance between measuring station j and the centroid of the county. [...] This method evaluates the mathematical relationship between the concentrations of the pollutant measured at the sampling stations and an auxiliary variable (or an index that represents the aggregation of several auxiliary variables on the territory), and then uses this mathematical relationship to interpolate and estimate the concentrations of the pollutant on the territory at the locations where