A recirculating loop method for producing and/or using ozone is disclosed. The method comprises the steps of: supplying a gas mixture comprising oxygen and a catalyst, generating ozone from the gas mixture, and recirculating the gas mixture. In a preferred method, the method comprises the additional steps of: reacting the ozone with a chemically reactive species and adding sufficient oxygen to the oxygen and noble gas mixture to maintain the specific oxygen to noble gas ratio. Preferably, the ozone is generated by electrical discharge from oxygen and noble gas mixtures of a volume ratio of not greater than 9 to 1 oxygen to catalyst gas. The closed loop apparatus for generating ozone gas comprises: an electrical discharge chamber, a means for supplying oxygen to said electrical discharge chamber, a means for supplying a catalyst to said electrical discharge chamber, an application chamber connected to said electrical chamber, a means for supplying a chemically reactive species to said application chamber, a means for removing said chemically reactive species from said application chamber, a means for returning oxygen and the catalyst to said electrical discharge chamber.