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The temperatures and gases composition in this layer are balanced to a point of sustain life. Above this layer is the stratosphere in which the a protective ozone layer forms. Ozone depletion occurs when the protective ozone layers within the stratosphere is destroyed. Forrest (1994) posits that without the stratosphere, we would not survive. The layer absorbs the hazardous Ultra Violet radiations emitted by the sun which would, otherwise, destroy the life of both animals and plants. This layer varies from time to time within various locations above the earth’s surface. It is considered thinnest over the polar regions especially over the Antarctic region. Within the Antarctic region, ozone layer depletion is greatest during winter and spring. The 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.The phenomenon in this case is called ozone hole, and it is largest in spring, although it occurs in both winter and summer. The other layers of the atmosphere include mesosphere, thermosphere and exosphere as shown in the diagram below.Ozone is a gas that occurs naturally and which concentrates into a layer in the stratosphere to form the protective stratospheric ozone layer. Siva and Reddy (2011) describe the ozone layer as the sunscreen of the earth. The layer is made up of ozone, which has molecules with three oxygen atoms (O3). The layer is located between 19km-50 km above the surface of the earth, and absorbs almost 99% of the high frequency rays of the sun. The ozone layer’s thickness varies with geographical locations and seasons. At lower ground levels, the reaction of some volatile organic substances and oxides of nitrogen (Wheeler, 2002) can also produce ozone. Ozone gas is one of the components of the urban smog and is often dangerous to humans and plants health. Therefore, despite the structure of ozone being similar in stratosphere and at ground level, it assumes two conflicting roles; protects life while at stratosphere but is a life hazard at ground level.Over the years, episodes of depletion of ozone have been occurring, and are described by the term ozone hole within the polar regions since the problem ozone depletion was recognizes during the late 1970s. Ozone 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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