Abstract: A photocatalytic air purifier (10) is provided which includes a tubular housing (1) having an inner and an outer wall, a central axis (A), a first end (2) having a centrally located air intake nozzle (4), a second end (5) having at least one air exhaust port (6), an air exhaust plenum (11) between the inner housing wall and a radial porosity medium (12), the porosity medium (12) extending radially and axially about the axis, and a housing central portion (13) defined by an interior perimeter of the radial porosity medium (12), the central housing enclosing an ultraviolet lamp (20) and a packing medium (30), the packing medium (30) extending radially and axially about the lamp (20) and comprising a plurality of spiral wound filaments (32) coated with a photocatalytic film.