We all are very familiar with the name of our planet "The Earth" where we all live but this is not the enough information about it. We must know everything about the earth. No doubt life exists on the earth but there are many harmful and useful aspects or you can say there are many friends and foes of this earth. As the title of this book shows that either ozone is protective or destructive layer. Ozone is a region of the upper atmosphere, between about 15 and 30 kilometers (10 and 20 miles) in altitude, containing a relatively high concentration of ozone that absorbs solar ultraviolet radiation in a wavelength range not screened by other atmospheric components. Also called Ozonosphere. Ozone layer is also called the "Earth's Sunscreen". Region in the upper atmosphere, about 6-30 mi (10-50 km) high, with significant concentrations of ozone, formed by the effect of solar Ultraviolet (UV) radiation on oxygen and also present in trace quantities elsewhere in earth's atmosphere. Ozone strongly absorbs solar UV radiation, causing atmospheric temperature to climb to about 30ºF (0ºC) at the top of the layer, and preventing much of this radiation from reaching earth's surface, where it would injure many living things. Chlorofluorocarbons or CFCs and some other air pollutants that diffuse into the ozone layer destroy ozone. In the mid-1980s, scientists discovered that a "hole" — an area where the ozone is up to 50% thinner than normal — develops periodically in the ozone layer above Antarctica. This severe regional depletion, explained as a natural seasonal depletion, appears to have been exacerbated by the effects of CFCs, and may have led to an increase in skin cancer caused by UV exposure. Restrictions on the manufacture and use of CFSs and other Ozone-destroying pollutants were imposed in 1978. Ozone layer or ozonosphere, region of the stratosphere containing relatively high concentrations of Ozone, located at altitudes of 12-30 mi (19-48 km) above the earth's surface. Ozone in the ozone layer is formed by the action of solar ultraviolet light on oxygen. This book is a comprehensive treatment of all these matters relating to the "Ozone" and is suitable for undergraduate as well as postgraduate students of environmental botany, ecology, environmental sciences, life sciences, agriculture, forestry, zoology and botany. Chapter of "Ozone Hole" is also described in this book. Ozone depletion, Ozone layer and ozone creation is described in detail. Effects of ozone on plants are described fully. All information about repairing the ozone hole is described in this book. The book will be helpful for the undergraduates and postgraduates of botany, environmental botany, environmental sciences, life sciences, ecology and for those working in related fields.
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