Scientific Assessment of Ozone Depletion: 2018

TWENTY QUESTIONS AND ANSWERS

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The complete Twenty Questions and Answers About the Ozone Layer: 2018 Update is available as a PDF download. In addition, all figures are available for download, in four formats: encapsulated postscript [eps], optimized for print [cmyk jpg], optimized for screen [rgb jpg], and png files optimal for presentations (i.e. PowerPoint). Figures from this report are in the public domain and may be used with proper attribution to source.

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Figure Q1-1: Ross J. Salawitch (Lead Author), David W. Fahey, Michaela I. Hegglin, Laura A. McBride, Walter R. Tribett, Sarah J. Doherty, Twenty Questions and Answers About the Ozone Layer: 2018 Update, Scientific Assessment of Ozone Depletion: 2018, World Meteorological Organization, Geneva, Switzerland, 2019.
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Twenty Questions and Answers About the Ozone Layer: 2018 Update

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Introduction

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Q1: What is ozone, how is it formed, and where is it in the atmosphere?

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Q2: Why do we care about atmospheric ozone?

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Q3: How is total ozone distributed over the globe?

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Q4: How is ozone measured in the atmosphere?

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Q5: How do emissions of halogen source gases lead to stratospheric ozone depletion?

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Q6: What emissions from human activities lead to ozone depletion?

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Q7: What are the reactive halogen gases that destroy stratospheric ozone?

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Q8: What are the chlorine and bromine reactions that destroy stratospheric ozone?

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Q9: Why has an "ozone hole" appeared over Antarctica when ozone-depleting substances are present throughout the stratosphere?

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Q10: How severe is the depletion of the Antarctic ozone layer?

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Q11: Is there depletion of the Arctic ozone layer?

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Q12: How large is the depletion of the global ozone layer?

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Q13: Do changes in the Sun and volcanic eruptions affect the ozone layer?

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Q14: Are there controls on the production of ozone-depleting substances?

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Q15: Has the Montreal Protocol been successful in reducing ozone-depleting substances in the atmosphere?

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Q16: Does depletion of the ozone layer increase ground-level ultraviolet radiation?

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Q17: Is depletion of the ozone layer the principal cause of climate change?

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Q18: Are Montreal Protocol controls of ozone-depleting substances also helping protect Earth's climate?

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Q19: How has the protection of climate by the Montreal Protocol expanded beyond the regulation of ozone-depleting substances?

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Q20: How is ozone expected to change in the coming decades?

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Appendix: Terminology

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Appendix: Acknowledgements

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