Cause Of Ozone Depletion

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THE CAUSE OF OZONE DEPLETION In this topic, only the anthropogenic causes of the ozone depletion will be discussed. Ozone-depleting substances (ODS) generally contain chlorine, bromine, fluorine, carbon, and hydrogen in varying sizes and are frequently depicted by the general term halocarbons. Chlorofluorocarbons, carbon tetrachloride, and methyl chloroform are important human-produced ozone-depleting gases that have been used in many applications including refrigeration, cleaning of electronic components, foam blowing, air conditioning, and as solvents. Another important group of human-produced halocarbons is the halons, which contain bromine, fluorine, carbon, and chlorine and have been mainly used in fire extinguishers. These chemicals are effective ozone-depleters for two reasons. The first is that they do not break down in the lower atmosphere - they can remain in the atmosphere from 20 to 120 years or more. The second is that they contain either/both chlorine and/or bromine and thus help the natural reactions that destroy ozone. Once they reach the stratosphere, ultraviolet radiation breaks up these molecules into chlorine and bromide free radicals, which, in turn, disintegrate ozone. The following information and data are taken from the Environment and Climate Change Canada. Chlorofluorocarbons Chlorofluorocarbons are a group of chemical substances that contain one, two or three carbon atoms and at least one atom each of chlorine and fluorine. CFCs were first

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