Abstract: A humidity responsive control device consists of a package having at least one face that is a permeable to liquid and gases and water vapor and is formed by mixing together a) 5 to 50% by weight of a hygroscopic polyacrylate and/or PVA polymer, b) 10 to 60% of porous silica minerals such as vermiculite and perlite, c) 5 to 50% of an absorbent such as zeolite or activated carbon for small molecules such as ammonia and d) 5 to 60% by weight of an aqueous emulsion of a mixture of an active ingredient of one or more of a bacteriocidal, fungicidal or odor masking compounds. The device is effective at eliminating and masking odors under varying humidity conditions.