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Why is it that ozone is not desirable at the surface of earth, but is desirable in the stratosphere?
Solution
Ozone occurs naturally in the stratosphere and is produced and destroyed at a constant rate. But
this "good" ozone is gradually being destroyed by manmade chemicals called
chlorofluorocarbons (CFCs), halons, and other ozone depleting substances (used in coolants,
foaming agents, fire extinguishers, and solvents). These ozone depleting substances degrade
slowly and can remain intact for many years as they move through the troposphere until they
reach the stratosphere. There they are broken down by the intensity of the sun's ultraviolet rays
and release chlorine and bromine molecules, which destroy "good" ozone. One chlorine or
bromine molecule can destroy 100,000 ozone molecules, causing ozone to disappear much faster
than nature can replace it.
It can take years for ozone depleting chemicals to reach the stratosphere, and even though we
have reduced or eliminated the use of many CFCs, their impact from years past is just starting to
affect the ozone layer. Substances released into the air today will contribute to ozone destruction
well into the future.
Satellite observations indicate a world-wide thinning of the protective ozone layer. The most
noticeable losses occur over the North and South Poles because ozone depletion accelerates in
extremely cold weather conditions.

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  • 1. Why is it that ozone is not desirable at the surface of earth, but is desirable in the stratosphere? Solution Ozone occurs naturally in the stratosphere and is produced and destroyed at a constant rate. But this "good" ozone is gradually being destroyed by manmade chemicals called chlorofluorocarbons (CFCs), halons, and other ozone depleting substances (used in coolants, foaming agents, fire extinguishers, and solvents). These ozone depleting substances degrade slowly and can remain intact for many years as they move through the troposphere until they reach the stratosphere. There they are broken down by the intensity of the sun's ultraviolet rays and release chlorine and bromine molecules, which destroy "good" ozone. One chlorine or bromine molecule can destroy 100,000 ozone molecules, causing ozone to disappear much faster than nature can replace it. It can take years for ozone depleting chemicals to reach the stratosphere, and even though we have reduced or eliminated the use of many CFCs, their impact from years past is just starting to affect the ozone layer. Substances released into the air today will contribute to ozone destruction well into the future. Satellite observations indicate a world-wide thinning of the protective ozone layer. The most noticeable losses occur over the North and South Poles because ozone depletion accelerates in extremely cold weather conditions.