Abstract: A process is described for cleansing and deodorizing an environmental space including deodorizing a space with an ozone treatment for a pre-selected time; and thereafter, automatically and without human intervention, exposing the space to a nebulized liquid, having ozone quenching properties and comprising an odor neutralizing or air freshening agent, to reduce ozone levels to a level safe for human exposure and to remove residual odors. An apparatus for carrying out the process and compositions for use in the process are further disclosed.