Air sterilizing unit comprising ion generating means (2) in which air for photocatalytic oxidation is prepared, and a photocatalytic oxidation chamber (3) in which photocatalysis takes place. The photocatalytic oxidation chamber (3) comprises at least one surface of activation (4) coated with titanium dioxide nanofibers and arranged on a base (6), and at least one UV LED (5) irradiating light on said surface of activation (4), the shape of said surface of activation (4) being configured according to the radiation pattern of the LED (5).
