World Ozone Day 16 sep 2020 | Doctors Gang News

Ozone for life

Ozone is a pale blue and toxic gas. This name has been given to a kind of pungent odor of the gas. Ozone gas is an explosive toxic gas. Yet this gas continues to save our lives. Ozone is essential for the survival of the earth's fauna. ‘Ozone for Life’ The theme of this year's International Ozone Day (September 16, 2020) is the United Nations Environment Program.

"Ozone for life" the theme for world ozone day 16 sep 2020.

The question may be, such an explosive poisonous gas how is it essential for the survival of human beings or the living creatures of the earth? The water example can be considered to answer this question. We know that water is another name for life. But drinking contaminated water from bad places can also cause death. Similarly, if there is a high concentration of ozone gas in the atmosphere around us, it becomes a threat to our health and life. It also causes damage to biodiversity. But if this ozone gas were not present in a particular layer of the atmosphere, it would be catastrophic for us and the living world.

The surface layer of the atmosphere above the surface is divided vertically into several parts from the bottom. These divisions are: troposphere, stratosphere, mesosphere, thermosphere, ionosphere and exosphere. The first layer on the surface is called the troposphere. This layer extends from eight to 15 kilometers steeply above the surface. At this level, only 10 percent of the total ozone is found. The next layer of the troposphere is called the stratosphere. The stratosphere extends steeply from 10 to 15 km upwards to about 50 km. About 90 percent of all ozone in the atmosphere is found in the stratosphere. This is why this layer is called ozone space or ozone layer. Excessive amounts of ozone in the troposphere, especially in landlocked areas, cause damage to humans and animals. On the other hand, if the amount of ozone in the stratosphere is low, it is also a cause of harm to humans and animals.

The ozone layer completely blocks the sun's harmful ultraviolet rays, especially the most radioactive and dangerous type, UV-C (wavelengths of 100-280 nanometers). Almost all of the Sun's relatively less radioactive type UV-B (wavelengths of 260-315 nanometers) absorb the ozone layer. If UV-C were not completely trapped in the ozone layer and most of UV-B was not absorbed, these two harmful rays would be released into the world. As a result, we were all affected by skin cancer and cataracts. Our immunity was also reduced. Marine organisms, unicellular organisms, crops and plants would be destroyed. So we are protected because we have the ozone layer. Protecting other animals on earth. This is why it is called ozone for life.

But as a result of our actions, the amount of ozone in the ozone layer at one time was alarmingly low. During dry cleaning including factories for making refrigerators, air conditioners, aerosols, foams, fire extinguishers, inhalers, etc., various gases containing chlorine and bromine (CFCs, halons, methyl chlorides, HCFCs, etc.) are released into the atmosphere into the stratosphere. Naturally some amount of chlorine and bromine gas is produced and reaches the ozone layer. When these gases reach the stratosphere, they react with the sun's ultraviolet rays and other chemicals to form various reactive gases (chlorine monoxide, bromine monoxide, hydrogen bromide, etc.). Studies have shown that these reactive gases destroy the ozone layer in the ozone layer. As a result the ozone layer becomes lighter and cavities are formed there.

Ozone is formed by the chemical reaction of sunlight and oxygen molecules in the atmosphere. Most ozone is formed in the stratosphere. Ozone is also produced in the troposphere naturally and through various man-made activities (such as fossil fuels). Ozone in the troposphere is also depleted somewhat naturally and through the release of various man-made gases into the atmosphere. If the amount of ozone created in the atmosphere is less than the amount of its destruction, then the ozone layer becomes lighter. The cavity is created.

The Vienna Convention was signed in 1975 and the Montreal Protocol in 1987, initiated by the United Nations Environment Program to protect the ozone layer. Representatives of different countries of the world signed it. The purpose of the convention was to reduce the production of ozone-depleting gases, such as chlorofluorocarbons (CFCs for short) and halocarbons and other related gases. Subsequently, several amendments were made to this convention or agreement. These amendments provide a new list of ozone depleting substances, alternatives, and timelines for their use.

The use of HFC (hydrofluorocarbons) was once suggested as an alternative to CFC. But studies have shown that while HFC does not destroy the ozone layer, it is increasing global warming as a greenhouse gas in the atmosphere. In this regard, an amendment (Montreal Agreement) was brought in Kigali, the capital of Rwanda in 2016 and it has been implemented from January 1, 2019. The main purpose of the amendment was to reduce the production and use of HFCs by 60 per cent in phases over the next 30 years.

The United Nations Environment Program (UNEP) says that these conventions or agreements on ozone protection are playing an effective role in protecting the ozone layer.
But an article published last April (2020) in the influential science journal Nature fears that the recovery of the ozone layer will be delayed. This article claims that CFC gas is being re-emitted from China. Another article published in the Atmosphere Journal on July 3, 2020, also expressed concern that the recovery of the ozone layer would be delayed. The matter is really worrying. In order to avoid the terrible problem of ozone depletion, all the countries concerned must work with honesty and sincerity.

Bangladesh signed the Kigali Amendment on June 6, 2020. Therefore, Bangladesh needs to take effective measures to stop CFC and use its alternatives in phases. This is undoubtedly a big challenge for Bangladesh. Because a lot of things in the country now (refrigerators, air conditioners, AC cars, inhalers, etc.) are HFC dependent. In addition, a large amount of equipment used in the previous HCFC is also running. They also need regular monitoring. To make the web page of the Ozone Cell in Bangladesh more informative, up-to-date and interesting, it needs to be linked directly to the web page of the Ozone Secretariat of the United Nations Environment Program  

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