Abstract: Devices and methods for the abatement of smoke odour contamination using pressurized ozone containing treatment gas is described. One of the devices comprises an assembly of components which generate an ozone containing treatment gas, pressurize the treatment gas and inject the treatment gas into a smoke-affected cavity through a penetration opening, preferably an opening through which smoke was forced into the cavity during the preceding fire. Used treatment gas can optionally be collected from the cavity, filtered and admixed with fresh ozone treatment gas. The devices and methods substantially obviate the cost and time intensive remediation method of stripping open smoke affected cavities for treatment.