The United Nations General Assembly proclaimed 16 September 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. Some good news! The UN says that the Ozone layer is 'showing signs of recovery' (BBC News, 11 September 2014) This YouTube clip has a bit of background information on the Ozone Layer and the Montreal Protocol: [embed]https://youtu.be/npEabdHX7vA[/embed] For further information and background materials to help you mark Ozone Day in your school, visit the UN's Ozone Day web pages. and the UN Environment Programme's ozone web page. The UN Environment Programme has also developed a suite of materials for children about ozone. And there is even an Ozzy Ozone website for children at: www.ozzyozone.org.