# Where is the ozone layer the thinnest?

## Question:

Where is the ozone layer the thinnest?

## The Ozone Layer:

The ozone layer is part of the stratosphere region in the atmosphere. It is important because ozone gas located here absorbs ultraviolet (UV) radiation.

The ozone layer is the thinnest over Antarctica. This region is referred to as the "hole" in the ozone layer. However, it is really a depletion of ozone gas, rather than an actual hole. During the 1920s until the 1970s humans used chlorofluorocarbons (CFCs) in aerosols and coolants. However, it was later discovered that these molecules destroy the ozone layer and were depleting it in large amounts, particularly over Antarctica. CFCs react with ultraviolet radiation in the stratosphere to release chlorine ions. These ions go on to react with ozone, destroying it. The atmosphere over Antarctica is such that it creates conditions that liberate even more chlorine atoms than other areas of the world. This is the main reason that the hole in the ozone layer is concentrated over Antarctica.