Introduction:

�����Our planet Earth is covered with a protective envelope that preserves us from the destructive rays of the sun. The atmosphere on Earth is mostly composed of 78% of nitrogen (N₂), 20% of oxygen (O₂), and other gases in very small amounts. Without this atmosphere there would exist no living being on our planet. Ironically, the wide industrialization that humans are involved in is damaging the atmosphere and the environment in which we are living in. Smog, acid rain, ozone depletion, carbon monoxide emissions, and global warming are some examples of how humans deteriorated the atmosphere. In this web site, we are going to focus on ozone depletion by examining the following points:

• How the ozone hole above the Antarctica was discovered.
• Consequences of a thinner ozone layer.
• What chemical process causes the depletion of stratospheric ozone.
• The legislation that decreases the use of ozone depleting chemicals.