RT null T1 OzoNews Vol XIX - 16 September 2019. Special Issue on the International Day for the Preservation of the Ozone Layer A1 United Nations Environment Programme, K1 ozone layer K1 Ozone YR 2019 FD 2019-09 LK https://wedocs.unep.org/handle/20.500.11822/29974 UL https://wedocs.unep.org/handle/20.500.11822/29974 NO - The United Nations Secretary-General António Guterres’ message for the International Day for the Preservation of the Ozone Layer, 16 September 2019- Commemoration of World Ozone Day 2019 - Video address by Inger Andersen, Executive Director, UNEP- World Ozone Day 2019, Letter to National Ozone Officers- Assessment Panels to the Montreal Protocol - A tribute on the occasion of World Ozone Day 2019- Copernicus Atmosphere Monitoring Service monitors a very unusual 2019 ozone hole DS UN Environment Document Repository RD Sep 18, 2026