A chlorine or bromine radical can act as a catalyst, breaking down how many ozone molecules in the stratosphere?

Chlorine and bromine radicals in the stratosphere are significant contributors to the depletion of the ozone layer due to their catalytic properties. A single chlorine or bromine radical is capable of breaking down a very large number of ozone molecules before it is deactivated or removed from the stratospheric environment. Research indicates that one chlorine or bromine atom can catalyze the breakdown of approximately 100,000 ozone molecules.

This process occurs because the radical reacts with an ozone molecule, resulting in the formation of an oxygen molecule and a new radical. This new radical can then react with another ozone molecule, continuing the cycle until the radical is transformed into a stable form that no longer participates in ozone destruction. Thus, the figure of 100,000 represents a conservative estimate of the ozone destruction potential of a single radical.

Understanding this catalytic process is essential for grasping the impact of halogenated chemicals on the ozone layer and underscores the importance of regulation and control of substances that can release these potent radicals into the atmosphere.