Causes of Depletion of Ozone layer
It is now established that chloroflouro
carbon (CFC) chemicals evolved from various refrigerants, coolants and
propellants are the primary reasons for depletion of ozone. CFC are a
group of chlorine bearing gases of low specific gravity. They rise to
stratosphere and mesosphere. Due to ionising solar radiation in these
layers, (which is the primary reason for production of ozone) fresh
chlorine gas is produced from CFCs. This nascent chlorine gas has the
capacity to react with ozone and bring down the level of ozone
substantially.
The concept of ozone depletion is new. But study of international ozone
trendis being made since 1988, when international ozone commission was
established. Extensive ozone assessment facilities were established
under International Middle Atmospheric Programme (IMAP) in India to
study ozone along with number of other green house gases.
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