The ozone layer is a portion of the earth’s atmosphere that absorbs UV (Ultra Violet) radiation from the sun. Location of the Ozone layer is the lower portion of the stratosphere. Ozone is made up of three atoms of oxygen. Most importantly, it absorbs the UV radiation and protecting the animals, humans and other living species on the earth. When chlorine and bromine atoms come into contact with ozone in the stratosphere, they destroy ozone molecules. Some natural processes, such as large volcanic eruptions, can have an indirect effect on ozone levels. 
Ozone (O3) forms when an oxygen atom (O) bonds with an oxygen molecule. It is a highly reactive gas, Ozone layer absorbs ultraviolet radiation, another type of solar energy that's harmful to humans, animals and plants. When ozone is broken, the oxygen atom bonds to an oxygen molecule to recreate ozone, but despite this shield, some UV still passes through to strike the earth’s surface. Sep 16 declared as ozone day the main theme of the ozone day protects the ozone layer and avoiding the global warming and save the earth from extreme radiation effect and make healthy environment.
Ozone Depleting Substances:
Mainly the Ozone depletion occurs from chlorofluorocarbons (CFCs), Hydrofluorocarbons and halons, etc. Chlorofluorocarbons:
Man-made molecules common to aerosols, refrigerator coolants, foam production, Many CFCs (chloroflurocarbons) have been widely used as refrigerants, propellants, solvents. These CFCs are harmful to the ozone layer; they are making ozone layer as thin and hole will be formed due to CFCs affect.
Halons:
Halon is a chemical compound formerly used in firefighting. According to Montreal protocol Halons are both atmospheric ozone depleters and greenhouse gases. These Halon gasses are making ozone depletion and air pollution also.
Hydrofluorocarbons:
HFCs are made of carbon, fluorine and hydrogen. They are exclusively synthetic, meaning they have no known natural sources. In general, HFCs are relatively non-flammable, chemically stable, and nonreactive. Many are colourless, odourless gases, The Montreal Protocol was a global agreement developed to stop this harmful ozone destruction.
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