Destruction of the Ozone Layer The ozone layer is a layer in Earth’s atmosphere which contains relatively high concentrations of ozone (O3). This layer absorbs 93-99% of the sun's high frequency ultravioletlight, which is potentially damaging to life on earth.
Despite Ozone Layer is vitally important to life because it absorbs biologically harmful ultraviolet (UV) radiation emitted from the Sun, but it is being destroyed, forming a big hole in it that is commonly referred to as the ozone hole . It is particularly created over Antarctica where exists a special condition that accelerates the depletion of the ozone layer.
Chlorofluorocarbons (CFCs) contain fluorine, carbon and chlorine atoms. Besides this, they are considered to be the main cause of Ozone depletion.
CFCs are widely used as coolants in refrigeration and air conditioners, as solvents in cleaners, particularly for electronic circuit boards, as a blowing agents in the production of foam (for example fire extinguishers), and as propellants in aerosols.
A chlorine atom reacts with an ozone molecule, taking an oxygen atom with it (forming ClO) and leaving a normal oxygen molecule. The chlorine monoxide (i.e., the ClO) can react with a second molecule of ozone (i.e., O3) to yield another chlorine atom and two molecules of oxygen.