Thus, ozone layer depletion has become a major concern among the environmentalists. These chemicals are found in cleaning agents, aerosols, insulating foam, and refrigerants. Effects and measures to protect ozone layer depletion. The thinning is most pronounced in the polar regions, especially over antarctica. These are released by soaps, solvents, spray aerosols, refrigerators, airconditioners, etc. Studies in 2008 predicted smoke from a regional nuclear conflict as described above would create ozone losses of 2545% above mid latitudes, and 5070% above northern high latitudes. Ozone air pollution and health studies have indicated that exposure to groundlevel ozone air pollution, even at very low levels, can cause a number of respiratory health effects particularly over time. The questions address the nature of atmospheric ozone, the chemicals that cause ozone depletion, how global and polar ozone depletion occur, and what could lie ahead for the ozone layer. Ozone depletion and the ozone hole have generated worldwide concern over increased cancer risks and other negative effects.
B dobson inferred correctly that the cause of the warm stratosphere was heating by the absorption of ultraviolet solar radiation by ozone, and he set out to. Ozone o3 is a stratospheric layer that plays important role in providing support to humans for their survival. Causes and effects of ozone layer depletion that are. Another most feared aspect of pollution is depletion of ozone layer of the stratosphere. Ozone depletion greenhouse gases and climate change. The production and emission of chlorofluorocarbons cfcs, is the leading cause of ozone layer depletion. Causes of ozone layer depletion and its effects on human.
The subtropical ground ozone concentration in northern hemisphere is twice the corresponding region in southern hemisphere 5. The ozone layer helps in absorbing the ultraviolet uv rays of the sun which are harmful to human beings. The earth is protected from excessive ultraviolet rays by an atmospheric ozone layer. There have been several concerns about ozone depletion. One of the main reasons for the widespread concern about depletion of the ozone layer is the anticipated increase in.
Effects of ozone depletion ozone depletion is affecting the human health and environment negatively, as it allows the penetration of uv radiations to reach the earth. Questions and answers about the environmental effects of. Global ozone depletion has been going on for years. Low temperatures, increase in the level of chlorine and bromine gases in the upper stratosphere are some of the reasons that leads to ozone layer depletion. Cause effect solution the ozone hole global warming tthe ozone hole and global he ozone hole and global wwarming 2arming 2 the ozone hole and global warming fact file if all the ozone above your head was collected in a continuous layer, it would. Stratospheric ozone depletion has further indirect health effects. Ozone depletion from the 1970s the depletion of the ozone layer started to capture the attention of the scientists, environmentalists, and the world community at large. Ozone depletion is primarily caused by human activities. What are the causes and effects of ozone depletion.
Global warming is caused by the greenhouse effect, which is essential to life as we know it on planet earth. To the point where a seasonal hole in the ozone layer began to appear above the antarctic. Twenty questions and answers about the ozone layer. Highly reactive species like hydrogen peroxide is produced which has bad effects on human health. Click download or read online button to get acid rain and ozone layer depletion book now. Cause of ozone depletion the depletion of ozone in the stratosphere by the number of gaseous pollutants like nitric oxide no, nitrous oxide n 2 o, chlorine cl, chlorofluorocarbons cfcs etc. Causes of ozone layer depletion the main things that lead to destruction of the ozone gas in the ozone layer. Cfcs account for almost 80% of the total depletion of ozone. These wavelengths cause skin cancer, sunburn and cataracts, which were projected to increase. Ozone blocks ultraviolet radiation ozone depleting substances are. Ozone layer and its role, the causes of ozone depletion, health and environmental effects of ozone layer depletion and. It is an essential factor for many global, biological and environmental phenomena.
Global warming and ozone layer depletion are two different problems see the sidebar misconceptions about global atmospheric change on page 95. Chlorofluorocarbons or the cfc are the main cause of ozone layer depletion. Predominantly, researchers have found that it is the introduction of artificial chemicals created by humans which contain bromine or chlorine. Many well accredited scientific studies have provided ample evidence for what effects are behind the depletion of the ozone. About depletion of the ozone layer is the anticipated increase in the amounts of. The ozone layer helps to protect life from harmful ultraviolet radiation. It is ideal photochemical maker due to its long life and stability 1 34. Causes of ozone depletion depletion of the ozone layer is due to the emission of a set of chemicals that cause ozone to convert into oxygen. Pdf files for other chapters and for the complete summary. This ozone layer sustains life on the earth by absorbing a great deal of uv ultra violet light radiating out of sun. B dobson and other scientists in measuring concentrations of chloride and ozone in the atmosphere g. This is the cause for the nearly 80% of the ozone depletion. The ozone hole in antarctica the seasonal thinning of the ozone layer of the earths atmosphere above antarctica, so allowing abnormal amounts of ultraviolet light to reach the earths surface in those regions. Nearly 500 organizations, teams, and individuals from 40 countries have received stratospheric ozone protection awards for their exceptional leadership, personal dedication, and technical achievements.
These gaseous pollutants react with the ozone to produce oxygen by. International day of the ozone layer protection were held at the secondary school 16. One important effect is that ozone depletion in the stratosphere increases the formation of photochemical smog, including ozone accumulation, in the lower troposphere. One of the main reasons for the widespread concern about depletion of the ozone layer. Protection against depletion of stratospheric ozone by chlorofluorocarbons. Ozone layer depletion cause, effects, and solutions. Ozone layer depletion, its causes and its effects ozone. Ozone depletion, ozone hole, ultraviolet radiation. During the lesson pupils of 11 class made reports on themes. Ozone layer depletion causes, effects and solutions 7. Tthe ozone hole and global he ozone hole and global global. Unlike pollution which has several causes, there is one specific chemical compound that is responsible for the breakdown of the ozone. Acid rain and ozone layer depletion download ebook pdf. The chlorofluorocarbon and the halons are potent ozone depletors.
Case study depletion of ozone in the atmosphere the work of g. Estimates of ozone depletion and skin cancer incidence to examine the vienna convention achievements. Click download or read online button to get ozone depletion greenhouse gases and climate change book now. The exposure to these radiations is severely affecting all life forms on earth. The ozone hole in antarctica cool antarctica, pictures. Climate change and human health risks and responses. Is depletion of the ozone layer the principal cause of climate change.
There are many situations where human activities have. A stratospheric smoke layer would also cause massive destruction of the protective ozone layer. Cfcs, hcfcs, halons, methyl bromide, carbon tetrachloride methyl chloroform. At the end of 20, 258 projects have been committed for an. Project report on ozone depletion environmental pollution. These radiations can cause severe diseases in humans such as skin cancer, eye damage and genetic mutations etc 9. Scribd is the worlds largest social reading and publishing site. Ozone depletion is allowing the uv radiation to earth surface. The ozone layer prevents most harmful uv wavelengths of ultraviolet light uv light from passing through the earths atmosphere.
It is revealed that introduction of chloroflourocarbons cfcs in the environment is the most rated cause of said depiction. Ozone layer depletion pdf file the origin, causes, mechanisms and bio effects of ozone layer depletion as. It is ideal photochemical maker due to its long life and stability. Report on kyrgyzstan nous activities devoted to the 16th. The answers are updates of those first presented in the previous ozone assessment, scientific assessment of ozone depletion. The ozone layer is a belt of the naturallyoccuring gas ozone that sits at an altitude of between 15 and 30 kilometers above the earth. There had been a lot of research on this topic over these years to find out all the possible causes that lead to this problem and the effects of ozone depletion. Find out what caused the ozone hole, and how the 1989 montreal protocol sought to put an end to ozone depletion. Questions and answers about the environmental effects of the ozone layer depletion and 4 climate change. Presentations ppt, key, pdf logging in or signing up. Scientific assessment of ozone depletion 2006 twenty.
The latest ozone layer depletion news is included at the foot of the page. Ozone depletion, gradual thinning of earth s ozone layer in the upper atmosphere caused by the release of chemical compounds containing gaseous chlorine or bromine from industry and other human activities. Ozone layer depletion, its causes and its effects free download as powerpoint presentation. Stratospheric ozone depletion, ultraviolet radiation and health pdf, 107kb. Within the stratosphere, the ozone layer is the portion that contains the highest.
Fire extinguishers contain halons and methyl bromide in the form of pesticides can also be also a cause for the depletion. Ozone depletion facts and information national geographic. The main effect of ozone depletion is an increase in uvb rays reaching the earths surface causes. The molecules of chlorofluorocarbons in the stratosphere are broken down by the ultraviolet radiations and release chlorine atoms. This site is like a library, use search box in the widget to get. Pdf causes of ozone layer depletion and its effects on. Due to stratospheric ozone layer depletion uv radiations are penetrating in earth atmosphere which result in the production of reduced oxygen. Symptoms of ozone exposure when people breathe ozone air pollution, the lining of their lungs can become irritated and inflamed. Stratospheric ozone protection awards since 1990, epa has recognized outstanding achievement in ozone layer protection. Ground ozone concentration is lower in polar and equatorial regions. A combination of low temperatures, elevated chlorine, and bromine concentrations in the upper stratosphere are responsible for the destruction of ozone.