Montreal Protocol
Montreal Protocol
The Kigali Amendment to phase down HFCs is discussed in a separate section here. The Montreal Protocol is phasing out ozone depleting substances that are controlled under the Protocol – the substances included in the various Annexes are listed in the Montreal Protocol Handbook.
Actions taken under the Montreal Protocol continued to decrease atmospheric abundances of controlled ozone-depleting substances (ODSs) and advance the recovery of the stratospheric ozone layer. Recovery of ozone in the upper stratosphere is progressing. Total column ozone (TCO) in the Antarctic continues to recover, notwithstanding substantial interannual variability in the size, strength, and longevity of the ozone hole. TCO is expected to return to 1980 values around 2066 in the Antarctic, around 2045 in the Arctic, and around 2040 for the near-global average (60°N–60°S). Source World Meteorological Organization Global Ozone Research and Monitoring Project – Report No. 278 Scientific Assessment of Ozone Depletion: 2022
Feedstock use of ozone depleting substances is allowed under the Montreal Protocol, but the quantities used must be reported. The Technology and Economic Assessment Panel (TEAP), in cooperation with the Scientific Assessment Panel as appropriate, provided in the TEAP 2024 progress report an update on the emissions from feedstock production, as by-products and from feedstock use of controlled substances. See 2024 TEAP Progress Report – Volume 1 available at https://ozone.unep.org/system/files/documents/TEAP-May2024-Progress-Report.pdf See Section 5.3 Response to Decision XXXV/8 on feedstock uses. This included a comparison of estimates of annual global emissions of controlled substances by species based on bottom-up calculations and atmosphere-based estimates made by the Scientific Assessment Panel. See Section 5.3.3.
For more information on the Montreal Protocol see the ozone secretariat website or the latest Montreal Protocol Handbook.
