September 16 was designated on December 19, 2000 by the United Nations General Assembly (one of the six principal organs of the United Nations serving as the main deliberative, policy-making, and representative organ of the UN) as the International Day for the Preservation of the Ozone Layer.
September 16 was designated by the United Nations General Assembly as the International Day for the Preservation of the Ozone Layer. This designation had been made on December 19, 2000, in commemoration of the date, in 1987, on which nations signed the Montreal Protocol on Substances that Deplete the Ozone Layer. The United Nations General Assembly (UNGA or GA; French: Assemblee generale, AG) is one of the six principal organs of the United Nations (UN), serving as the main deliberative, policy-making, and representative organ of the UN. 
