In the case of a method for molecular evaporation of fragrance substances and/or active substances (FA substances) and their dissemination by way of air streams in the surrounding air, in closed rooms, in ducts of ventilation and air conditioning systems, or the like, wherein FA substance, before its dissemination, is applied, in liquid form, in targeted manner, to a strip-shaped FA-substance carrier (6), it is providedthat the strip-shaped FA-substance carrier (6) is moved to circulate at least partly within a dissemination zone for FA substance, andthat the FA substance to be evaporated is heated, directly or indirectly, to a temperature that promotes molecular evaporation, during its circulation on the FA-substance carrier (6).
