Explain ozone layer, its depletion and effects of ozone depletion.

Ozone layer is a layer of ozone molecules in the stratosphere. Ozone forms when single O atm reacts with oxygen molecule, i.e. O + O2 → O3 (ozone). Ozone layer protects the earth from harmful Ultraviolet raidations from reaching the earth’s surface.

Substances that contain chlorine and/or bromine are found to deplete ozone layer and are known as ozone depleting substances. One single atom of chlorine destroys 1000 molecules of ozone. CFC’s are the major ODS present in the atmosphere.

Ozone depletion would result in penetration of the harmful Uv radiations that will spread diseases like cataract and also lower the immunity.