Figure 4.3: Percentage of measured one-hour and 24-hour average SO2 concentrations within air quality categories at Packe Street and Coles Place in central Christchurch
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There are four charts measuring SO2 concentrations in Christchurch. The first two charts show one-hour and 24-hour concentrations at Packe Street from 1992 to 2001. Measurements were usually “Excellent”. The second two charts show one-hour and 24-hour concentrations at Coles Place from 1998 to 2001. All concentrations were predominantly “Excellent”, but the 24-hour concentrations declined slightly over the period.
