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What are the main causes of depletion in the ozone layer?

Ozone is a molecule made of three oxygen atoms. It is present in the upper atmosphere of Earth and protects us from the harmful ultraviolet radiations of the Sun. It was observed a few decades ago that the thickness of this friendly ozone layer is decreasing, especially over Antarctica. There are a couple of causes of this depletion of the ozone layer. Natural causes, such as stratospheric winds, can cause this depletion. However, this is a very minor cause. 


The most significant reason for depletion of the ozone layer are certain chemicals that humans use, which are termed as ozone-depleting substances. Prominent among these is a class of chemicals known as CFCs or chloro-fluoro carbons. These chemicals were commonly used as refrigerants in air conditioners and refrigerators, in dry-cleaning agents, etc. These chemicals have since been banned. Some of the other man-made chemicals that are responsible for ozone depletion include carbon tetrachloride, halons, methyl chloroform, etc. 


Hope this helps. 

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