The present technology provides an illustrative method for treating air. The method includes providing untreated air and producing an oxygen-enriched sample from the untreated air. The method further includes generating ozone in the oxygen-enriched sample to produce an ozone-enriched sample and contacting the ozone-enriched sample and a fraction of the untreated air to produce a treated sample. The fraction of the untreated sample includes a fraction removed from the untreated air when producing the oxygen-enriched sample. The method also includes removing ozone from the treated sample to form a purified sample of air.