Ozone depletion is actually a criterion for measuring the amount of damage some activities and materials has done to the ozone layer . For instance ,CFC and HCFCS . For more information please click here. Such chemicals have been widely used in refrigerators, freezers , air conditioners , aerosol propellants, and fire extinguishers. Another damaging chemical is Methyl Bromide . The main application of Methyl Bromide is in pest controlling . In fact, Methyl Bromide covers the soil to sterilize it before farmers plant the crops .

What is Ozone layer?

It is a thin layer in the atmosphere of earth. Its importance is because it can attract almost all the harmful Ultraviolet rays .This vital protective layer has unfortunately been damaged in recent decades.

Ozone layer depletion

When and where did scientists notice the Ozone layer depletion ?

In 1969 the Dutch meteorologist and chemist , Paul Crutzen , announced that Nitrogen Oxide negatively affects the ozone level in atmosphere. The Nobel Prize winner described this destructive reaction for the first time. He explained that Nitrogen Oxide reacts with free oxygen. Therefore, it decreases the production of Ozone (O3) in the atmosphere . This can even lead to decomposition of ozone to Nitrogen Dioxide (NO2) and oxygen (O2). He discovered this negative phenomenon in Antarctica .After that ,Antarctic survey ,published in 1985, noted that approximately 60% of depletion happened in spring during 1970s. However, the good news is that the ozone hole in this region is gradually recovering . This is the direct result of international agreements to seriously reduce the consumption of harmful chemicals.

Ozone depleting recovery:

With the increasing public awareness about the hazards of using CFC and Methyl Bromine , scientists tried to restrict the application of these materials. Montreal Protocol in 1987 was the first international treaty to protect this valuable layer. According to this Protocol halogenated hydrocarbons groups are the main cause of the depletion of stratospheric ozone .As a result ,by 2005 the production of damaging chemicals was reduced by roughly 90%-95%. Nevertheless, there is still a long way to save the ozone layer and the planet More information.