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Updated: Nov 18, 2025

Design and Use of a Full Flow Sampling System FFS for the Quantification of Methane Emissions
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A decline in global CFC-11 emissions during 2018-2019.

Stephen A Montzka1, Geoffrey S Dutton2,3, Robert W Portmann4

  • 1Global Monitoring Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO, USA. stephen.a.montzka@noaa.gov.

Nature
|February 11, 2021
PubMed
Summary

Global emissions of trichlorofluoromethane (CFC-11) significantly decreased in 2019, indicating a reduction in unreported production. This accelerated decline in CFC-11 concentration suggests limited future ozone depletion if sustained.

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