The International Day for the Preservation of the Ozone Layer is observed globally on 16 September every year. The theme for 2017 is ‘Caring for all life under the sun’. The day was designated by the United Nations General Assembly (UNGA) on December 19, 1994.
Ozone Layer :
The Ozone layer is fragile shield of gas which protects Earth from harmful ultraviolet (UV) radiation of Sun and thus helping preserve life on the planet. It contains high concentrations of ozone (O3) in relation to other parts of the atmosphere. Stratospheric Ozone is not harmful, but its presence on land it is harmful.
Montreal Protocol :
It is an international treaty designed to protect ozone layer by phasing out production of numerous Ozone Depleting Substances (ODSs) that are responsible for ozone depletion. It was agreed on 26 August 1987 in Montreal, Canada and entered into force on 26 August 1989.
Protection of the Ozone Layer :
It is multilateral environmental agreement agreed upon at the 1985 Vienna Conference and entered into force in 1988. It is one of the most successful treaties of all time in terms of universality. It has been ratified by 197 states (all UN members as well as the Niue, Holy See and the Cook Islands) as well as European Union.