This research investigates the effects of ozone (O₃) and hydrogen peroxide (H₂O₂) doses, as well as the dissolved organic carbon (DOC) concentration, on O₃ and hydroxyl radical (^•OH) exposures (i.e., ∫[O₃]dt and ∫[^•OH]dt) during the peroxone (O₃/H₂O₂) process. The addition of H₂O₂ during the ozonation process accelerated the O₃ decomposition into ^•OH, increasing ∫[^•OH]dt while decreasing ∫[O₃]dt. The optimal [H₂O₂]/[O₃] input ratio for maximizing ∫[^•OH]dt was found to be around 0.2; at higher ratios, additional H₂O₂ consumption did not further increase ∫[^•OH]dt. At higher DOC concentrations, both oxidant exposures decreased, and the effect of H₂O₂ on ∫[^•OH]dt was diminished due to competitive reactions between H₂O₂ and DOC for O₃, as well as scavenging of ^•OH by DOC. An increase in ∫[^•OH]dt in the peroxone process exhibited a linear correlation with the [O₃]/[DOC] ratio when the [H₂O₂]/[O₃] input ratio was fixed at 0.2.