In this issue : 1. UN Secretary-General António Guterres’ Message on the International Day for the Preservation of the Ozone Layer “Marking the 30th Anniversary of the Montreal Protocol” 16 September 2017 2. UN Environment Executive Director Erik Solheim's Ozone Day 2017 Message 3. UN Environment Deputy Executive Director Ibrahim Thiaw's Ozone Day 2017 Message 4. On the Occasion of the 30th Montreal Protocol Anniversary, International Ozone Day, OzonAction is Pleased to Launch its Latest App, the: GWP-ODP-CALC 5. Message from Shamila Nair-Bedouelle, Head of OzonAction, to the National Ozone Officers – 2017 Ozone Day Celebrations!