The temperatures and gases composition in this layer are balanced to a point of sustain life. Aove this layer is the stratosphere in which the a protective ozone layer forms. Oone depletion occurs when the protective ozone layers within the stratosphere is destroyed. Frrest (1994) posits that without the stratosphere, w would not survive. Te layer absorbs the hazardous Ultra Violet radiations emitted by the sun which would, oherwise, dstroy the life of both animals and plants. Tis layer varies from time to time within various locations above surface.
I is considered thinnest over the polar regions especially over the Antarctic region. Wthin the Antarctic region, oone layer depletion is greatest during winter and spring. Te largest ozone hole ever recorded was over the Antarctic polar region in 2006. Typically this region has the largest cases of ozone holes occurring in winter and spring. Te phenomenon in this case is called ozone hole, ad it is largest in spring, athough it occurs in both winter and summer. Te other layers of the atmosphere include mesosphere, termosphere and shown in the diagram below.
Oone is a gas that occurs naturally and which concentrates into a layer in the stratosphere to form the protective stratospheric ozone layer. Sva and Reddy (2011) describe the ozone layer as the sunscreen of the earth. Te layer is made up of ozone, wich has molecules with three oxygen atoms (O3). Te layer is located between 19km-50 km above the surface of the earth, ad absorbs almost 99% of the high frequency rays of the sun. Te ozone layer’s thickness varies with locations seasons.
At lower ground levels, te reaction of some volatile organic substances and oxides of nitrogen (Wheeler, 2002) can also produce ozone. Oone gas is one of the components of the urban smog and is often dangerous to humans and plants health. Terefore, dspite the structure of ozone being similar in stratosphere and at ground level, i assumes two conflicting roles; potects life while at stratosphere but is a life hazard at ground level. Oer the years, eisodes of depletion of ozone have been occurring, ad are by the ozone hole within the polar regions since the problem ozone depletion was recognizes during the late 1970s.
Oone hole denotes a region in which the depletion of the ozone layer is quite severe such that it is below 200 Dobson units. ..
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