Figure 4.7: Percentage of measured one-hour and 24-hour average SO₂ concentrations within air quality categories in Greymouth, 2001

Text description of figure

There are two charts showing one-hour and 24-hour concentrations of SO₂ in Greymouth from June to September 2001. Concentrations were predominantly “Excellent”, although there was a slight dip in quality in one-hour concentrations during winter.