RT Report
T1 Twenty Questions and Answers About the Ozone Layer: 2014 Update - Scientific Assessment of Ozone Depletion 2014
A1 World Meteorological Organization, 
A1 United Nations Environment Programme, 
A1 National Oceanic and Atmospheric Administration, 
A1 National Aeronautics and Space Administration, 
A1 European Commission, 
A2 Hegglin, Michaela
A2 Fahey, David
A2 McFarland, Mack
A2 Montzka, Stephen
A2 Nash, Eric
K1 ozone
K1 ozone-depleting substance
K1 ozone layer
SN 978-9966-076-02-1
YR 2015
FD 2015-01
LK https://wedocs.unep.org/handle/20.500.11822/26719
UL https://wedocs.unep.org/handle/20.500.11822/26719
NO This report provides a scientific update on the state of the stratospheric ozone layer and the impact of the Montreal Protocol. By synthesising data from atmospheric observations, laboratory studies, and computer modelling, the document examines the chemical processes driven by human-produced halogen source gases that lead to ozone depletion. Key findings indicate that global compliance with international regulations has successfully slowed the accumulation of ozone-depleting substances, with initial signs of recovery now detectable. The analysis highlights that while the Antarctic ozone hole remains a significant seasonal phenomenon, the ozone layer is projected to return to 1980 levels by the mid-twenty-first century. Furthermore, the report clarifies the complex relationship between ozone depletion and climate change, noting that many regulated substances are also potent greenhouse gases.
DS UN Environment Document Repository
RD Sep 18, 2026