Question

Write a short note on Depletion of ozone layer. ​

Answer 1

Answer:

Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons—gases formerly found in aerosol spray cans and refrigerants—are released into the atmosphere (see details below). CFCs and halons cause chemical reactions that break down ozone molecules, reducing ozone's ultraviolet radiation-absorbing capacity.

Answer 2

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Depletion of Ozone Layer

Due to environmental pollution, ozone layer has began to deplete in the 1980s. This was mainly due to the increasing use synthetic chemicals like Chlorofluorocarbons (CFCs). These are used in refrigerants as coolant and in fire extinguishers.

CFCs are very stable. These are found to persist in the atmosphere. Being stable, they do not degrade easily and rise high up in the atmosphere. In the atmosphere, UV radiations breakdown CFCs molecules and release chlorine atom. These atoms on reacting with ozone, dissociates ozone molecules into oxygen.

Thus, decreasing amount of ozone results in the depletion of ozone layer. An example of ozone layer depletion can be observed in Antarctica.

The United Nations Environment Programme (UNEP) succeeded in forming an agreement to freeze CFCs production at 1986 levels.

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