<span>Ozone is mainly found in two regions of the Earth's atmosphere. Most (90%) are found in stratosphere and some (10%) are found in troposphere.
</span><span>The ozone layer protects the DNA of all surface dwelling life, by absorbing UltraViolet-B from our Sun. </span> It is caused by the release of chlorofluorocarbons (CFCs)<span>, </span>hydrofluorocarbons (HCFCs)<span>, and other </span>ozone-depleting substances (ODS)<span>, which were used widely as refrigerants, insulating foams, and solvents. </span>