An apparatus for dispersing an active substance has an active-substance reservoir from which active substance can be extracted and introduced into an interior space by an air stream. In order to achieve with as little expenditure as possible that the air stream has a temperature level which is optimum for extracting the active substance from the active-substance reservoir, it is proposed that the apparatus for dispersing an active substance has a mixing station, at which air streams having different temperatures are able to be mixed to the air stream so that the latter is able to be adjusted to an optimum temperature level for extracting the active substance, preferably between 19° C. and 24° C.
