Figure 8.15: Concentration of equivalent effective stratospheric chlorine, 1969–2006
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Note:
ppb = parts per billion.
Source: National Institute of Water and Atmospheric Research.
Text description of figure
Concentrations of equivalent effective stratospheric chlorine steadily rose from 0.74 ppb in 1969 to a peak of 1.93 ppb in 1997. Since 1997 levels have been gradually declining to a level in 2006 of 1.7 ppb.
