The invention relates to an air cooling device (1) for a vehicle, notably a motor vehicle, comprising:—at least a reserve (3) of liquid, —a device (5) for nebulizing the liquid, —at least two air outlets (7) for diffusing at least an air flow (F1, F2) intended for the interior of the said vehicle, and—at least two nebulizing ducts (9) respectively intended to have passing through them an air flow (F1) laden with droplets of nebulized liquid, each nebulizing duct (9) being arranged in fluidic communication with the reserve (3) of liquid and with an associated air outlet (7). According to the invention, the air cooling device (1) comprises at least one nebulizing regulating member (19) to regulate the flow rate of the air flow (F1) laden with droplets of nebulized liquid passing along a nebulizing duct (9) and to be diffused through the air outlet (7) associated with this nebulizing duct (9).