Four-reaction cycle forming/destroying stratospheric ozone: O₂+hν→2O (λ<242 nm), O+O₂+M→O₃, O₃+hν→O₂+O, O+O₃→2O₂. Predicts qualitative ozone layer but overestimates steady-state [O₃]; catalytic cycles (Cl, NO, HO_x) close the gap.
Four-reaction cycle forming/destroying stratospheric ozone: O₂+hν→2O (λ<242 nm), O+O₂+M→O₃, O₃+hν→O₂+O, O+O₃→2O₂. Predicts qualitative ozone layer but overestimates steady-state [O₃]; catalytic cycles (Cl, NO, HO_x) close the gap.