A method is disclosed to provide a diffusion procedure (D) during which at least one characteristic of said diffusion is controlled in order to confer a diffusion desired for said composition, and, before the execution of said diffusion procedure (D), to execute a previous procedure of treatment (T1) of the air of the environment, said previous treatment (T1) procedure intending to: measure at least one physico-chemical parameter of said air; compare said measured parameter to a threshold; and, if said threshold is exceeded by said measured parameter, activate a device for treatment of the air that is arranged in order to modify said parameter in compliance with said threshold.
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