Asked by Wiki User. In addition, UVB has been linked to the development of cataracts, a clouding of the eye’s lens. Ozone is a very simple molecule made up of three oxygen atoms (hence, O 3). What causes ozone depeletion? Scientists have observed a reduction in stratospheric ozone since the early 1970s. Laboratory and epidemiological studies demonstrate that UVB causes non-melanoma skin cancer and plays a major role in malignant melanoma development. These chemicals are widely known as ODS, an acronym for Ozone-Depleting Substances. It is made of layers that surround the Earth like rings. However, 99% of its total mass lies in two regions within the first 50 kilometres above the Earth's surface. A relatively high concentration of these ozone molecules float around 12 … Causes of Ozone layer depletion. These gaseous pollutants react with the ozone to produce oxygen by which the net result is the depletion of ozone. CFC's cause ozone depletion. The halogen source gases in Figure Q7-1 are also known as “ozone-depleting substances” because they are converted in the strato-sphere to reactive gases containing chlorine and bromine (see Q8). Credible scientific studies have substantiated that the cause of ozone layer depletion is human activity, specifically, human-made chemicals that contain chlorine or bromine. 2 3 4. The main causes of ozone depletion are as follows: Nitrogen system: It causes 60% of ozone destruction. These two regions are called the troposphere and the stratosphere. Ozone depletion and its causes. Main Issue; What We Do; Results; Looking Ahead; Main Issue. Ozone Layer Depletion. The atmosphere extends a few hundred kilometres above the Earth. Ozone Depletion Potential. Some of these reactive gases participate in reactions that destroy ozone (see Q9). Answer. 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. Ozone layer depletion increases the amount of UVB that reaches the Earth’s surface. Example: Nitrogen system can be explained by taking an example of nitrous oxide (N 2 O). These chemicals are widely known as ODS, an acronym for Ozone-Depleting Substances. 2014-03-30 12:36:48 2014-03-30 12:36:48. Credible scientific studies have substantiated that the cause of ozone layer depletion is human activity, specifically, human-made chemicals that contain chlorine or bromine. stratospheric ozone depletion. The troposphere is closest to the Earth. Wiki User Answered . Ozone-Depleting Substances have been proven to be eco-friendly, very stable and non … Top Answer. The source gases that con-tain only carbon, chlorine, and fluorine are called “chlo-rofluorocarbons,” usually abbreviated as CFCs. Causes of Ozone Layer Depletion.