The present invention is a system or device and method of providing air purification in combination with fragrancing in a single unit, such as a tabletop unit for home or office use in conjunction with a method of optimizing the air delivery rate versus noise specification of an air freshening device. Preferred compounds include Bi oxide, Co oxide, Cu oxide, Fe oxide, Mn oxide, and Pr oxide, and optionally Ag oxide. The liner is disposed around the reactive material and connected to the nozzle. A double rack-and-pinion assembly guides opening and closing of the molds and a locking system having locking shafts engaging apertures in a cross head with pivoting locking keys movable into alignment with the apertures prevents inadvertent mold opening. The controllable interferometer has a controllable delay in a first or second arm for adjusting the relative phase of the light passing therethrough. Selective positioning of a cylindrical lens into a first position within the path of light transforms collimated light to a rectangular wedge that is incident upon the sensor surface at numerous angles.