ClO2 is a chemical compound made up of a chlorine atom and two oxygen atoms. Although chlorine dioxide has "chlorine" in its name, it is vastly different from chlorine. It is gentler and more selective, allowing it to be more efficient and effective when reacting with other substances like odor molecules. ClO2 oxidizes, so unlike chlorine, it will not produce environmentally harmful organic compounds containing chlorine. It binds with an odor molecule, selectively oxidizing the odor molecule and rendering it odorless leaving clean, fresh air.