Store chains and service providers beguile customers with a pleasant shopping atmosphere often realized by installing scent diffusers to evaporate overwhelming fragrances. Such systems named as olfactory technology are becoming a standard interior of commercial locations as well as public places and are more and more gain importance in human-computer interaction. This paper delivers insight into current air design technology, the psychological background of scent marketing and gives a basis of discussing the relevance of olfactory communication for pervasive advertising and human-computer interaction.