Abstract: The invention concerns a cartridge to diffuse scents, comprising a hollow tubular body adapted to allow the internal circulation of air. In order to optimize the diffusion of the scent, the body comprises At least one primary internal part in contact with the flow of air, and impregnated with an odorizing substance in order that the flow of air absorbs the perfume, and At least one secondary internal part adjacent to the first part which allows the free circulation of the flow of air. The invention also concerns a scent diffuser comprising a cartridge associated to a blower as well as a system comprising several diffusers and a controller.