Figure 2.1: Percentage of measured one-hour and eight-hour average CO concentrations within air quality categories at Queen Street (Tisdalls), Auckland

Text description of figure

There are two charts measuring CO concentrations at Queen Street (Tisdalls) , Auckland, from 1992 to 2000.

The second chart shows CO concentrations for eight-hour periods. The concentrations generally fall within the “good” guideline, and have increasingly done so over the period. The “Alert” concentration is reached only very occasionally.

The first chart shows CO concentrations (measured by categories of air quality) for one-hour periods at Queen Street (Tindalls), in Auckland from 1992 to 2000. The concentrations meet the “Excellent” category, and have increasingly done so over the period. For the rest of the time, the “Good” and “Acceptable” categories have been met.