There are huge environmental affects of deplete in ozone. Global warming is one such.
The biomass seems to maintain a level of oxygen, from which ozone is made. If biomass is burned, chlorinated / brominated compounds are released into the atmosphere, some small part of whihc make it to the ozone layer to increase depletion.
The ozone layer is spread throughout. However some countries have a ozone hole in it.
Ozone layer blocks about 97% of the the total received by the earth. Ozone depletion or ozone hole will expose earth to harmful radiations and will burn the life. The temperature will increase and make earth inhabitable place.
The ozone is harmful not at stratosphere. It is harmful at some layer. Te layer is troposphere.
There is not actually a hole in the ozone layer. The ozone has been reduced below some limit.
Ozone layer is created by natural processes. UV and thunder are some of them.
Some elements are blamed for ozone layer. These are CFC's.
See "What does the ozone layer do?"
If the ozone layer is destroyed, harsh consequences will follow. There will be no life.
The release of CFC's lead to ozone layer depletion. It reacts with ozone to deplete it.
The layer is heated. Some oxygen, nitrogen, and ozone molecules are destroyed. Ozone is made. This is how the ozone layer returns after the polar winters deplete the layer. Lack of sunlight is the major issue with ozone depletion and the ONLY method that allows the ozone to return.