The invention relates to a method for controlling unpleasant odours in discharge air from containers, rooms or plants in which strong smelling substances such as feces, waste or highly odorous foods are stored or processed, in which a fluid is introduced into the discharge air in a finely distributed form, which physically and/or chemically neutralizes the odour of the substances contained in the discharge air. In order to improve such a method with regard to its effectiveness and at the same time to considerably reduce the amount of active substances required, the invention proposes that the fluid is a 0.1% to 8% aqueous solution of an active substance concentrate which is 55-65 wt.-% triethylcitrate, 17.5 to 22.5 wt.-% 1,2 propanediol and 17.5 to 22 wt.- % di-propylene glycol-methylether. Alternatively, the fluid can also be a mixture of a suitable propellant gas mixture and the active substance concentrate specified above.
