Ozone Depletion and World Ozone

Topics: Ozone depletion, Ozone layer, Chlorofluorocarbon Pages: 3 (661 words) Published: September 19, 2013
World ozone Day
The International Day for the Preservation of the Ozone Layer is observed on 16 September every year since 1995. This date has been chosen by the United Nations General Assembly in its resolution 49/114, to remember the signing of the Montreal Protocol on Substances that Deplete the Ozone Layer in 1987. The year 2012, also marks the 25th anniversary of the Montreal Protocol.

What is Montreal Protocol?
The Montreal Protocol on Substances that Deplete the Ozone Layer is an international treaty designed to save the ozone layer by phasing out the production of numerous substances believed to be liable for ozone depletion. The treaty was signed on September 16, 1987, which entered into force on January 1, 1989. It is thought that if the international accord is adhered to, the ozone layer is expected to recover by 2050.

Ozone layer
The ozone layer is a layer in Earth`s atmosphere, that has relatively high concentrations of ozone (O3). It is mainly found in the lower portion of the stratosphere, 15-35km above Earth. The ozone layer was first discovered by Professor Gordon Dobson of Oxford University in 1957. 


The ozone layer is very important to humans and other organisms on Earth as it absorbs biologically harmful ultraviolet (UV) radiation coming from the sun. Effects of the ozone layer depletion by human activities on the planet could be disastrous.

While ozone is beneficial in the stratosphere, it is also a pollutant when present near the ground as it contributes to the formation of photochemical smog and acid rain.

Causes of Ozone layer depletion
Stratospheric ozone is being destroyed by a group of manufactured chemicals, containing chlorine and bromine. These chemicals are called “ozone-depleting substances” (ODS). 

The main ODS include:- 

Chlorofluorocarbons (CFCs) 

Halons (brominated fluorocarbons) 

Methyl Chloroform 

Carbon Tetrachloride 

Hydrofluorocarbons (HCFCs) 
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