Ozone depletion at high levels in the atmosphere is caused by:

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Chlorofluorocarbons (CFCs) are a group of human-made chemicals that were commonly used in refrigeration, air conditioning, and aerosol sprays. When they are released into the atmosphere, they can react with ozone and break it down into oxygen, causing ozone depletion. This is particularly concerning in the upper atmosphere, where the ozone layer acts as a shield against harmful UV radiation from the sun.

Ozone Depletion at High Levels in the Atmosphere Is Caused