The invention relates to a method providing a diffusion procedure where diffusion is controlled in order to confer a diffusion desired for the composition, and, before the execution of the diffusion procedure, a previous procedure of treatment of the air of the environment occurs. The previous treatment procedure measures at least one physico-chemical parameter of said air; compares the measured parameter to a threshold; and, if the threshold is exceeded by the measured parameter, activates a device for treatment of the air that is arranged in order to modify the parameter in compliance with the threshold.
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