World Ozone Day is observed on September 16, every year. It is celebrated to spread awareness among people about the depletion of the Ozone Layer and search for possible solutions to preserve it. On this day, people from all over the world are expected to join the Montreal protocol to join the talks and seminars. A number of commonly used chemicals have been found to be extremely damaging to the ozone layer. Life on Earth would not be possible without sunlight. But the energy emanating from the sun would be too much for life on Earth to thrive were it not for the ozone layer. This stratospheric layer shields Earth from most of the sun’s harmful ultraviolet radiation. The first ozone hole was discovered 30 years ago in May 1985 over Antarctica. Later, NASA found out the whole of Antarctica was affected and the temperature had begun to rise. The Ozone layer, also known as the Ozone shield, is a delicate layer of gas in the Earth’s stratosphere that absorbs most of the Sun’s ultraviolet rays, which is harmful to human life and other life forms. These rays can cause numerous skin diseases. The layer absorbs about 97 to 99 percent of ultraviolet rays and maintains the ozone-oxygen cycle. On December 19, 1994, the United Nations General Assembly proclaimed September 16 the International Day for the Preservation of the Ozone Layer, commemorating the date, in 1987, on which the Montreal Protocol on Substances that Deplete the Ozone Layer was signed. On September 16, 1987, the United Nations and 45 other countries signed the Montreal Protocol, on substances that deplete the Ozone layer. Every year, this day is celebrated as the International Day for the Preservation of the Ozone layer. The Ozone layer is a piece of the atmosphere that has high ozone concentrations. Ozone is a gas that is made of three oxygen atoms, O3. Depending on where the ozone layer is, it can either harm life or protect life on Earth. Most of the ozone stays within the stratosphere, whereby it acts as a shield, protecting the surface of the Earth from the harmful ultraviolet radiation of the sun. If this shield was to weaken, we would all be more susceptible to impaired immune systems, cataracts, and skin cancer.