1) Ozone (03) is basically highly reactive and colorless gas. Each molecule of ozone layer is made up of three oxygen atoms.
2) In the middle of 1980's, ozone layer above the Antarctic, was particularly impacted by pollution.
3) Scientists identified in the year 1985, that there is a thinning of the ozone layer in Antartica.
4) It is now commonly known as the depletion or ozone hole. The ozone layer over Antarctica forms each spring and lasts for 6 weeks approximately.
5) Ozone is demolished mainly by chlorine(CL) based compounds like chlorofluorocarbons (CFCs), chlorinated solvents like carbon tetrachloride, as well as fire-extinguishing chemicals and halons.
6) It was estimated that 1 chlorine atom could destroy 1,00,000 ozone molecules. Halons emits bromine(BR) atoms, which even more possibility of destroying ozone.
7) Chlorine formed from swimming pools, industrial plants, sea salt, and volcanoes does not goes up to stratosphere as they combined with water, which causes no effect.
8) Above atmosphere, the three-oxygen-atom of ozone forms the ozone layer, which helps in shielding the life of the earth from the sun's UV (ultraviolet) radiations.
9) About 90% of CFC's are emitted by industrialized countries in the parts of Northern Hemisphere, which included United States and Europe.
10) Without the protective layer of ozone of stratosphere, UV radiation will cause numerous health problems like skin cancers and immune suppression in humans.