United Nations
Environment
Programme
UNEP/OzL.Pro.27/CRP.2/Rev.1
3 November 2015
Original: English
Twenty-Seventh Meeting of the Parties to
the Montreal Protocol on Substances
that Deplete the Ozone Layer
Dubai, United Arab Emirates, 1–5 November 2015
Agenda item 11
Other matters
Draft decision XXVII/[…]: Investigation of carbon
tetrachloride discrepancies
Submission by the European Union
The Twenty-Seventh Meeting of the Parties decides:
Reiterating its concern about the discrepancy between observed atmospheric concentrations
and data on carbon tetrachloride reported in the 2014 assessment reports of the Technology and
Economic Assessment Panel and the Scientific Assessment Panel, indicating that the mismatch
between bottom-up inventories and global top-down estimates of carbon tetrachloride remains
unresolved,
Noting with concern that derived emissions of carbon tetrachloride, based on its estimated
lifetime and its accurately measured atmospheric abundances, have become much larger over the last
decade than those from reported production and usage, notwithstanding that some of the discrepancy
could be explained by additional sources unrelated to reported production, such as contaminated soils
and industrial waste, and that additional explanations could include underreported releases to the
atmosphere and incorrect partial lifetimes (stratosphere, ocean or soil),
Recalling decisions IV/12, X/12, XVI/14, XVIII/10, XXI/8 and XXIII/8,
To request the Technology and Economic Assessment Panel and the Scientific Assessment
Panel to continue their analysis of the discrepancies between observed atmospheric concentrations and
reported data on carbon tetrachloride and to report and provide an update on their findings to the
Twenty-Eighth Meeting of the Parties to the Montreal Protocol on Substances that Deplete the Ozone
Layer.
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