Figure 2.2: Percentage of measured one-hour and eight-hour average CO concentrations within air quality categories at Queen Street (carpark site), Auckland

Text description of figure

There are two charts measuring CO concentrations in Queen Street (car park), Auckland, from 1998 to 2001.
The first chart shows one-hour concentrations of CO (measured by air quality categories). For about 98% of the time the “Good” and “Excellent” categories have been met.

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. The amount of times concentrations have been in the “Alert” category has decreased over the period.