How did the ozone layer get a hole?

Question:

How did the ozone layer get a hole?

Importance of the Ozone Layer:

The ozone layer is a collection of ozone in the stratosphere that helps protect us from the Sun's radiation. The ozone gas molecules are able to absorb ultraviolet (UV) radiation that is harmful to living things on Earth.

Answer and Explanation: 1

The ozone layer developed a hole due to the use of chlorofluorocarbons (CFCs). These molecules were invented in the 1920's and were believed to be harmless to the environment. However, in the 1970's scientists discovered that CFCs actually were destroying the ozone layer. CFCs persist in our atmosphere and enter the stratosphere. Here, UV radiation strips a chlorine atom from the molecule. The chlorine atom then goes on to attack ozone, creating diatomic oxygen gas and chlorine monoxide. Interaction with free oxygen once again liberates the chlorine ion and it can go to destroy more ozone.


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