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The ozone molecule is unstable (although, in the stratosphere, long-lived) and when ultraviolet light hits ozone it splits into a molecule of O 2 and an individual atom of oxygen, a continuing process called the ozone-oxygen cycle.
Ozone is quite the double-edged sword. When found at ground level atmosphere, this gas serves as a dangerous, harmful pollutant. As a molecule in Earth's stratosphere, it protects us by absorbing harmful UV radiation from the sun that causes a variety of health problems in humans, plants, and other animals, as well as damages ecosystems. The ozone layer in the stratosphere is thin but powerful. However, because it occurs in such a low concentration, it's vulnerable to ozone-depleting chemicals, such as CFCs. CFCs are compounds that react with ozone in the presence of UV light by splitting the three oxygen atoms into one O2 molecule and one ClO molecule. The ClO molecule may react with a single oxygen atom, creating more atmospheric oxygen and a single chlorine atom, which is then free to start the cycle anew.