How is the ozone layer being destroyed?

Answer 1

The ozone layer is concentrated at a height of 20 to 25 Kms.The use of chloroflurocarbons(CFC) as propellants in aerosol sprays,refrigerators,cleaning agents, insulants, plastic foam and coolants are the main eaters of ozone in the ozone layer.
Highly instable,an ozone molecule readily splits when hit by ultra-violet radiation.Thus the energy of the harmful UV radiation is converted into harmless heat and never reach the earth's surface.The above split produces a free oxygen atom(o) and an oxygen molecule(o2).In an ongoing cycle, these two again combine to form new ozone molecules.
The chloroflurocarbons drift slowly upward to reach the stratosphere by convection.They are very stable and can live upto 100 years.
In the stratosphere,the CFC molecule is hit by the UV radiation,releasing a chlorine atom.This chlorine atom in turn, attacks the ozone molecule ,releases one of the three oxygen atoms and combines with it to form chlorine monoxide thereby killing an ozone molecule.
Now the remaining free oxygen atoms in turn pulls the oxygen atom from the chlorine monoxide freeing the chlorine atom to restart the cycle.Thus ozone molecules are progressively decomposed.It has been estimated that one chlorine atom can eat upto100000 ozone molecules.
This is how the ozone layer is destroyed.

Answer 2

CFCs..chemicals end up in the upper atmosphere where they are broken down to produce chlorine (Cl). Due to circulation in the atmosphere, concentrations develop over the poles. In Antarctica, this occurs predominantly during the winter months. When the sun returns in spring, the chlorine is able to react with ozone in the presence of sunlight in a very complex catalytic reaction. However, the end result is demonstrated below:

Cl + 03-->ClO + O2
ClO + O-->Cl + O2
----------------------
Net Cl + 03 + O - > Cl + 2O2

now the Cl realised from this reaction can destroy another ozone molecule. chain reaction!

Answer 3

By CFC's and other chlorine compounds which react vigorously with the ozone breaking it down into plain oxygen compounds

Answer 4

when the cfc of the chloroflurocarbon goes up to the air and reaches the ozone layer, it will destroy the ozone layer..

Answer 5

By the airline industry.