The ozone hole is a region of the stratosphere over Antarctica (and a smaller one over the Arctic) that is depleted of ozone in the local spring.Chloroflourobcarbons (CFCs) and halons (bromine) contribute greatly to the thinning of the ozone layer. These substances are emitted from man made activities, they reach stratospheric layer of the atmosphere and they release halogen atoms through photodissociation and these atoms lead to breakdown of ozone (O3) to oxygen (O2).
Ozone layer is being depleted and the ozone hole begin to show up.The ozone hole is geographically defined as the area where the total ozone amount is less than 220 Dobson Units.
The ozone layer is a belt of naturally occurring gas ozone. It is 15 to 30 kilometres away from the surface of the Earth protecting it from the harmful ulra violet radiation emitted by the sun. This layer has deteriorated and been damaged by our pollution, those activities that release bromine and chlorine into the atmosphere.
These affect oxygen atoms in ozone and rips apart the ozone molecule. The damage is worst over the Antarctic where pollution has reduced the ozone by 65%since the 1980s. This massive deterioration is what some have been referring to as a 'hole' in the ozone layer.
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