Ozone is a gas made up of three oxygen molecules. It forms a protective layer in Earth's atmosphere that shields us from harmful ultraviolet radiation coming from the sun. Full definition
Changes in ozone layer concern mainly the stratosphere and I used to think there are very few molecules (even atoms, in fact) upward. (realclimate.org)
For the first time, it has been shown that the rate of ozone depletion in the upper stratosphere — 35 to 45 kilometres up — is slowing down. (newscientist.com)
Thus, continued release of excess nitrogen to the environment will probably accelerate climate change with time and will also lead to the formation of more ozone holes in this century. (issues.org)