The sun propagates ultraviolet radiations which as an adverse effect on living beings. Ozone layer importance, depletion, effects and protection of. Protecting the ozone layer and reducing global warming. It protects us from harmful uv rays that can have serious effects on animals, biodiversity and peoples health, including skin cancer and eye cataract. Ozone layer protection programme in indonesia 11182014 10 ods consuming industrial sectors are the heart of the ozone protection montreal protocol programme. Ozone layer depletion causes increased uv radiation levels at the earths surface, which is damaging to human health. That is, ozone depletion in the upper atmosphere will allow more ultraviolet radi. Without ozone, the suns intense uv radiation would sterilize the earths surface. Enhanced control on ozone depleting substances ods 4. Apr 18, 2019 the ozone layer helps to protect life from harmful ultraviolet radiation. But through domestic and international action, the ozone layer is healing and should fully recover by about 2065. 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.
The ozone layer protects living things from harmful ultraviolet rays from the sun. The ozone layer helps to protect life from harmful ultraviolet radiation. When highenergy ultraviolet rays uvc strike an oxygen. Ozone layer the ozone layer is basically naturally occurring gas in the region of stratosphere where ozone particles are accumulated 2. This is the cause for the nearly 80% of the ozone depletion. Negative effects include increases in certain types of skin cancers, eye cataracts and immune deficiency disorders. The ozone layer was discovered in 19 by the french physicists. In humans, it increases the risk of conditions such as skin cancer, suppression of the immune system and eye cataracts. Stratospheric ozone depletion has further indirect health effects. Achievements in stratospheric ozone protection ozone.
Causes, effects and solutions of ozone layer depletion. Nearly 90% of earths ozone is in the stratosphere and referred to as the ozone layer. In the layer surrounding the earths surface, the troposphere, ground level or bad ozone is an air pollutant that is a key ingredient to. Amendment to the schedule to the ozone layer protection ordinance cap. Dec 12, 2016 frequently asked questions and answers about the montreal protocol pdf 7 pp, 187 k contact us to ask a question, provide feedback, or report a problem. Experts blame ozonelayer depletion on manmade chemicals containing chlorine and bromine that are emitted from a. Jan 14, 2016 achievements in stratospheric ozone protection this report describes the achievements of the people, programs, and organizations that are working to protect the earths ozone layer. Ozone in the stratospherea layer of the atmosphere between 15 and 50 kilometers 10 and 31 miles above usacts as a shield to protect earths surface from the suns harmful ultraviolet radiation.
Ozone layer protection and transition to climatefriendly alternatives. This website addresses stratospheric ozone issues, including the science of ozone depletion, epas regulatory approach to protecting the ozone layer, epa. An international consensus about the causes and effects of ozone depletion has emerged. Ozone is a paleblue gas that forms a layer in the stratosphere of our atmosphere called ozone layer. Revamping the industries producing the chlorofluorocarbons cfcs. Use of ecofriendly chemicals in the refrigeration and airconditioning industry.
The vienna convention for the protection of the ozone layer was agreed in 1985, by governments determined to protect human health and the environment against adverse effects resulting from the depletion of the earths protective ozone layer. The vienna convention for the protection of the ozone layer 3 2. The vienna convention for the protection of the ozone layer is a multilateral environmental agreement signed in 1985 that provided frameworks for international reductions in the production of chlorofluorocarbons due to their contribution to the destruction of the ozone layer, resulting in an increased threat of skin cancer. It was agreed on 16th september 1987, and entered into force on 1st january 1989. Overexposure to uv radiation can cause a range of health effects, including skin damage skin cancers and premature aging, eye damage including cataracts, and suppression of the immune system.
Human activities and ozone layer free download as powerpoint presentation. One important effect is that ozone depletion in the stratosphere increases the formation of photochemical smog, including ozone accumulation, in the lower troposphere. This layer absorbs the radiations and prohibits them from entering the outer surface of the earth. As a result the total amount of ozone remains constant. We care about ozone depletion because a thinner ozone layer allows more uv radiation to reach the earths surface. The increase in the levels of uv rays lead to high rate of skin cancer and eye related problems. The chlorofluorocarbon and the halons are potent ozone depletors. However, the ozone layer is destroyed by manmade chemicals known as ozonedepleting substances ods. Find out what caused the ozone hole, and how the 1989 montreal. Achievements in stratospheric ozone protection ozone layer. Ozone depleting substances are the substances such as chlorofluorocarbons, halons, carbon tetrachloride, hydrofluorocarbons, etc. Ozone is harmful at ground level but high up the atmosphere ozone layer plays a vital role in the protection of all living beings.
In 1987, leaders from many countries came together to sign a landmark environmental treaty, the montreal protocol on substances that deplete the ozone layer. Ozone in the lower atmosphere contributes to global warming and climate change. Purposes the purpose of this law is, with a view to protecting the ozone layer through. The ozone layer is the common term for the high concentration of ozone that is found in the stratosphere around 1530km above the earths surface. Frequently asked questions and answers about the montreal.
Negative effects include increases in certain types of skin cancers. The ozone layer department of the environment and energy. Nearly 500 organizations, teams, and individuals from 40 countries have received stratospheric ozone protection awards for their exceptional leadership, personal dedication, and technical achievements. Effective implementation of montreal protocol concluded in 1987 for protection of the ozone layer. It covers the entire planet and protects life on earth by absorbing harmful ultravioletb uvb radiation from the sun. Ozone layer is also naturally broken down but there is a balance between its formation and natural depletion. The emission of ozone depleting substances has been damaging the ozone layer. Ozone layer depletion cause, effects, and solutions. Ozone depletion is largely a result of manmade substances. One chlorine can destroy 100,000 molecules of ozone.
Fire extinguishers contain halons and methyl bromide in the form of pesticides can also be also a cause for the depletion. Ozone layer depletion causes, effects and solutions 7. May 23, 2019 ozone is a paleblue gas that forms a layer in the stratosphere of our atmosphere called ozone layer. There are natural processes that create and destroy ozone in the stratosphere. In 1977 the united nations environment programme unep concluded a world plan of action on the ozone layer, which called for intensive international research and monitoring of the ozone layer, and in 1981, uneps governing council authorized unep to draft a global framework convention on stratospheric ozone protection.
The ozone layer has historically protected the earth from the harmful uv rays, although in recent decades this protection has diminished due to stratospheric ozone depletion. Protection against depletion of stratospheric ozone by chlorofluorocarbons. The ozone layer of the atmosphere protects life on earth by filtering out some of the harmful ultraviolet uv radiation from the sun. Introduction the ozone layer is a layer in earths atmosphere which contains relatively high concentrations of ozone o3. It contains high concentrations of ozone o3 relative to other parts of the atmosphere. Ozone layer depletion is the thinning of the ozone layer present in the atmosphere. The thinning is most pronounced in the polar regions, especially over antarctica. The ozone layer was discovered in 19 by the french physicists charles fabry and henri buisson. It is revealed that introduction of chloroflourocarbons cfcs in the environment is the most rated cause of said depiction. Human activities that can damage or affect the ozone. The law concerning the protection of the ozone layer through the control of specified substances and other measures law no. Presence of ozone in the lower atmosphere is considered as a pollutant and a greenhouse gas.
Mar 21, 2020 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 absorbs a band of ultraviolet radiation called uvb. The question is often asked why the world moved so quickly in dealing with ozone layer depletion, yet has moved so slowly in addressing the equally critical problem of climate change. Sep 30, 2019 the ozone layer has historically protected the earth from the harmful uv rays, although in recent decades this protection has diminished due to stratospheric ozone depletion. Causes of ozone layer depletion and its effects on human. Ozone is a naturally occurring gas that is found in two layers of the atmosphere. High ozone exposure reduces crop yields and forest growth. Pdf causes of ozone layer depletion and its effects on. Protection against depletion of stratospheric ozone by. Ozone depletion consists of two related events observed since the late 1970s. These industries produce, store, consume, distribute and release the ods through their manufactured andor serviced products. Index terms bio effects, chlorofluorocarbon, ozone layer depletion, protection. Ozone layer depletion leads to decrease in ozone in the stratosphere and increase in ozone present in the lower atmosphere. This layer absorbs 9399% of the suns high frequency ultraviolet light, which is potentially damaging to life on earth 1.
The ozone layer is mainly found in the lower portion of the stratosphere. Phasing out hcfc refrigerants to protect the ozone layer. In fact whole world is vulnerable to its after affects. Reducing the use of ozone depletion substances ods. Find out what caused the ozone hole, and how the 1989 montreal protocol sought to put an end to ozone depletion. Protecting the ozone layer department of the environment. Uv radiation also affects terrestrial and aquatic ecosystems, altering growth. Ozone depletion is allowing the uv radiation to earth surface. To this end the parties shall, in accordance with the means at their disposal and their capabilities. Vienna convention for the protection of the ozone layer. Stratospheric ozone depletion, ultraviolet radiation and. As our scientific knowledge about ozone depletion grew, so too did the response to the issue. Lets have a look at some of the solutions to ozone layer depletion. The causes, mechanism and bioeffects of ozone layer depletion on humans were addressed.
Ozone protection stratospheric ozone protection awards since 1990, epa has recognized outstanding achievement in ozone layer protection. The stratospheric ozone layer is earths sunscreen protecting living things from too much ultraviolet radiation from the sun. Presentation on ozone depletion linkedin slideshare. Why the ozone layer is vital to life on earth the ozone layer is a protective shield that blocks the suns harmful ultraviolet rays from reaching the earths surface. Thus, ozone layer depletion has become a major concern among the environmentalists. Ozone layer protection environmental protection department. The ozone layer is mainly found in the lower portion of the stratosphere, about 20 to 30 km 12 to 19 miles above the earth, though the thickness varies seasonally and geographically. The montreal protocol on the protection of the global ozone layer is a somewhat unique example of how the world can respond when faced with a serious environmental threat. Following is the list of some of the main ozone depleting substances and the sources from where they are released. Ozone layer importance, depletion, effects and protection. This layer absorbs about 99% harmful solar radiations like uv rays, x rays, gamma rays etc. This happens when the chlorine and bromine atoms in the atmosphere come in contact with ozone and destroy the ozone molecules.
Achievements in stratospheric ozone protection this report describes the achievements of the people, programs, and organizations that are working to protect the earths ozone layer. It describes the benefits of these achievements, including healing the ozone layer, saving lives, and protecting the planet. The parties that agreed the convention were aware that measures to protect the ozone layer from. Frequently asked questions and answers about the montreal protocol pdf 7 pp, 187 k contact us to ask a question, provide feedback, or report a problem.
956 1548 1308 1177 1134 787 880 393 1509 1175 51 575 714 1483 1433 396 902 624 1547 164 503 923 1250 1171 275 1101 869 763 1062 814 806 196 1308 1055 609 689 1172 365 100 1041 1254