Described is a device (1) for reducing pollutants in a gaseous mixture comprising: •a containment body (2) having an inlet portion (3) for the gaseous mixture and an outlet portion (4) for the gaseous mixture, the containment body (2) imposing on the gaseous mixture a fixed direction of flow (D), •at least one filtering unit (10) comprising a photocatalytic filter (7) interposed, along the fixed direction of flow (D), between a first light source (6a) and a second light source (6b), both having a wavelength in the visible spectrum (400-700 nm), the photocatalytic filter (7) comprising a photocatalytic nanoparticle coating and the nanoparticle coating comprising titanium dioxide doped with a nitrogen doping agent. •a unit (5) for straightening the flow before the filtering unit (10).

Compositions, systems and methods for using zeolites to eliminate scents and odors are disclosed. The compositions and methods use a zeolite, preferably a dry flowable powder of zeolite, desiccant, and monocalcium phosphate to eliminate scent. Applications of using the compositions and systems are also disclosed, including eliminating human scents and other odors to enhance ability for a hunter, wildlife enthusiast, photographer and the like to access proximity to an animal that is otherwise deterred by scents. Other applications of use are also disclosed.