Figure 8.14: Average yearly ozone levels over New Zealand, 1970–2006
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Notes:
(1) Five-year averages have been plotted to give an indication of trend in ozone concentration.
(2) DU = Dobson units.
Source: National Institute of Water and Atmospheric Research.
Text description of figure
This graph displays ozone concentration measurements over New Zealand from 1970 until 2006. Concentrations from 1970 until the early 1980s were high typically in excess of 314 DU. Since the early 1980’s concentrations have been less than 314 DU. Lower levels (<300 DU)are particularly apparent in 1997, 1999, 2000 and 2006.
