Figure 2.19: Percentage of measured one-hour and eight-hour average CO concentrations within air quality categories at Hornby and Beckenham, Christchurch
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There are four charts measuring CO concentrations in Christchurch.
The first two charts measure one-hour and 8-hour CO concentrations at Hornby, Christchurch, from 1995 to 2001. The 8-hour concentrations have improved over the period until almost all measurements were “Excellent” in 2001. One-hour concentrations have been consistently “Excellent” throughout the period.
The second two charts measure one-hour and 8-hour CO concentrations at Beckenham from 1995 to 1997. Air quality increased over the period, and in 1997 readings were almost entirely “Excellent”.
