The highest ozone concentrations are in the upper stratosphere, where the UV concentrations are also the highest

There is no ozone left in the atmosphere due to the ozone hole which destroyed it all.

Ozone is found in the highest concentrations in the troposphere, where is is generated from lightening strikes and internal combustion engines

The highest concentrations of ozone are found in the lower stratosphere, where most of the UVb and UVc are absorbed.