Methods for simulating air quality due to vehicles and the associated effects on stormwater runoff quality in an urban environment and their coupling are examined. To achieve this aim, the models (traffic, emission, atmospheric dispersion, and stormwater) must be carefully selected according to the special requirements and the level of details needed for the integrated system. The present study focuses on the interface between the air quality and stormwater models. The development of this interface raises questions concerning the processes treated to represent mass transfer between the atmosphere and stormwater. Moreover, other pollutant sources are added to road pollutants in an urban context: the evaluation of this new modelling chain with observations needs to distinguish between pollutants linked to traffic emissions and other pollutants. To assess the contamination of water runoff induced by traffic, concentrations of cadmium (Cd), lead (Pb), and zinc (Zn) in the Grigny catchment in France were simulated using typical pollutant deposition fluxes measured at roadside. The highest simulated concentrations of Cd, Pb, and Zn at the outlet were 2.12, 284.61, and 1757 µg L-1 respectively. These results show that pollutant concentrations are increased up to three times with an explicit description of road contaminant sources. Therefore, an exhaustive knowledge of the spatial distribution of roads with heavy traffic is important to predict water quality in urban areas.