= Solution
Outside the cold polar activation regime, cooling generally slows temperature-activated gas-phase <ozone> destruction and can increase <ozone> if other conditions are held fixed. This is a weaker, less universal conclusion in the lower <stratosphere> because transport and imported <ozone> are important. Enhanced sulfate-surface activation or unusually cold cloud-forming air can instead activate <chlorine> and reverse the purely gas-phase tendency. \b[Distinguish a local chemical cooling effect from the dynamical response of the midlatitude <ozone-column photolysis shielding>.]
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