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Figure 7.1: The percentage of measured 24-hour average PM10 concentrations within air quality categories in Gisborne
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Text description of figure
There is a chart showing 24-hour average concentrations of PM10 measured in Gisborne between 1993 and 2000. Over the period concentrations were mainly 'good' (at least 80 per cent), while in 2000 all readings were in the 'good' category. In 1998 a small (1-2 per cent) of concentrations were in the 'alert' category, or over the guideline.
