The difference between near-surface ozone and high altitude ozone is that high altitude ozone is adequate ozone as it is a UV shield and the surface zone is destructive ozone as it is harmful to life forms.
The major reasons for ozone depletion include the excessive accumulation of greenhouse gases, CFCs, propellents, manufactured chemicals, etc.
High altitude ozone is found at the topmost height in the region of the stratosphere, while surface ozone is found just above the troposphere.
Therefore, it is well described above.
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