(Decisions adopted by MOP37 are based on the advance English version of document
UNEP/OzL.Pro.37/9/Add.1 and may change in the final version)

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).