Protecting the Ozone Layer
September 16 marks International Day for the Preservation of the Ozone Layer, which was first proclaimed by the United Nations General Assembly in 1994, commemorating the date, in 1987, of the signing of the Montreal Protocol on Substances that Deplete the Ozone Layer. The purpose of marking this date is to limit the production and use of anthropogenic (man-made) chemical substances that caused the ozone hole.