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| Discussion Paper circulated for comments by scientific community | Fall 2020 |
| Lead Author and Review Editor teams established | late 2020 |
| First meetings of SSC with Lead Authors | February 2021 |
| Chapter extended outlines complete | 16 April 2021 |
| Chapter First Order Drafts (FODs) complete | 6 August 2021 |
| External review of FODs | October 2021 |
| First draft of updated 20 Q&As complete | November 2021 |
| Chapter Second Order Drafts (SODs) complete | 28 January 2022 |
| Assessment team meeting, Boulder, CO, USA | March 2022 |
| Chapter Third Order Drafts (TODs) completed | 13 May 2022 |
| Second draft of updated 20 Q&As complete | May 2022 |
| All cited papers accepted for publication | 31 May 2022 |
| Panel Review Meeting for Executive Summary, Geneva, Switzerland | 25-29 July 2022 |
| 2022 Ozone Assessment submitted to the WMO Ozone Secretariat | December 2022 |
