Decision XXXVII/2: Emissions of HFC-23

The Thirty-Seventh Meeting of the Parties,

Noting with appreciation the updated information on HFC-23 emissions submitted by the Technology and Economic Assessment Panel and the Scientific Assessment Panel to the Thirty-Seventh Meeting of the Parties to the Montreal Protocol on Substances that Deplete the Ozone Layer in response to decision XXXVI/3,^[1]

Recognizing with appreciation the concerted efforts taken by parties since the entry into force of the Kigali Amendment to the Montreal Protocol,

Decides:

1. To request the Technology and Economic Assessment Panel and the Scientific Assessment Panel to provide an update on emissions of HFC-23 to the Thirty-Eighth Meeting of the Parties to the Montreal Protocol on Substances that Deplete the Ozone Layer, taking into account the information submitted by parties in response to decision XXXVI/3 and pursuant to paragraph 2 below and including the following:
   1. Additional analysis of the discrepancy between reported emissions and those derived from atmospheric measurements, including the methodologies applied;
   2. A description of the information and data sources used, identifying any gaps or limitations;
   3. Additional information on methodologies adopted by parties for estimating and reporting HFC-23 emissions as well as best practices for improvements to minimize such emissions;
2. To invite parties that have HCFC-22 production facilities and did not submit information pursuant to decision XXXVI/3 to submit to the Ozone Secretariat, by 28 February 2026, on a voluntary basis, their current methodologies for estimating and reporting HFC-23 emissions from HCFC-22 production;
3. To invite relevant parties:
   1. To report 2025 data, consistent with form 6 of the data reporting forms, on the amounts of HFC-23 generated, captured, destroyed and stored;
   2. To examine, as appropriate, their HFC-23 emissions and the sources of those emissions and encourage scientific research institutions in their countries to undertake or collaborate internationally on research on their HFC-23 emissions and the sources of those emissions, and to report to the Ozone Secretariat new relevant information, if any.

^[1] United Nations Environment Programme, Report of the Technology and Economic Assessment Panel, Volume 2, Response to Decision XXXV/7: Emissions of HFC-23, September 2025 (Nairobi, 2025).