World Ozone Day 2018: Benefits of Online Learning takshilalearn posted on 7 years ago — updated on 1 second ago 327 views pWorld Ozone Day 2018: Benefits of Online Learning. September 16 was designated by the United Nations General Assembly as the International Day for the Preservation of the Ozone Layer. Save Trees, Go Online/p https://www.takshilalearning.com/world-ozone-day-2018/