Data denotes the measured concentrations of trichlorofluoromethane (CFC-11) gas in the Northern and Southern Hemisphere, collected via air collection and analysis automated onsite instrumentation with gas chromatography coupled with electron capture detection (GC–ECD). This allows for measurement of CFC-11 concentrations in mole fractions (parts per trillion). Data here represents the annual average for data reported in Montzka et al. (2018).

The WMO (2003; 2010 and 2014) projections are those published by the World Meteorological Organization (WMO) and represent the global average expected change in CFC-11 concentrations based on reported emissions of CFC-11 from all parties to the Montreal Protocol.

Sources

Data Published By: Montzka, S. A., Dutton, G. S., Yu, P., Ray, E., Portmann, R. W., Daniel, J. S., ... & Nance, J. D. (2018). An unexpected and persistent increase in global emissions of ozone-depleting CFC-11. Nature, 557(7705), 413.

Data publisher source:

Link: https://www.nature.com/articles/s41586-018-0106-2