Figure 2.4: Percentage of measured one-hour and eight-hour average CO concentrations within air quality categories at Khyber Pass, Auckland
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Text description of figure
There are two charts measuring CO concentrations in Khyber Pass, Auckland, from 1996 to 2001.
The first chart shows one-hour concentrations of CO (measured by air quality categories). Air qualities have improved consistently over the period, with concentrations being measured at “Good” or “Excellent” for almost all of 2001.
The second chart shows eight-hour concentrations of CO (measured by air quality categories). Air qualities have improved since 1997 (where a small number of concentrations measured were over the guideline values).
