Figure 2.3: Percentage of measured one-hour and eight-hour average CO concentrations within air quality categories at Takapuna, Auckland
Return to the point in the document where this figure is located.
Text description of figure
There are two charts measuring CO concentrations in Takapuna, Auckland, from 1995 to 2001 (with no measurements in 2000).
The first chart shows one-hour concentrations of CO (measured by air quality categories). For over 90% about of the time the “Good” and “Excellent” categories have been met, with a sharp increase of the “Excellent” value in 2001.
The second chart shows eight-hour concentrations of CO (measured by air quality categories). The “Excellent” and “Good” categories have been met the majority of the time, and their share has increased over the period (apart from a decrease of “Excellent” values in 1999). The amount of times concentrations have been in the “Alert” category has decreased over the period.
