Dhaka, Sept. 17 -- In 1994, the UN General Assembly proclaimed 16 September the International Day for the Preservation of the Ozone Layer, commemorating the date of the signing, in 1987, of the Montreal Protocol in the Vienna Convention on Substances that Deplete the Ozone Layer. Bangladesh has been observing the day since 1990 following signing of the protocol in the same year. In 1930, two French physicists Charles Fabry and Henri Buisson first discovered the ozone layer. The ozone layer is a layer of earth's atmosphere that has relatively high levels of ozone gas. This layer is mainly located in the lower part of the stratosphere.

The closure of the hole in the ozone layer was observed 30 years after the Montreal Protocol was signed. ...