Figure 2.18: Maximum eight-hour average CO concentrations and number of days per year the guideline value was exceeded at Packe Street, Christchurch
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The chart measures the maximum 8-hour average CO, and the days that CO exceeded the 8 hour guideline at Packe St, Christchurch, from 1998 to 2001. The maximum 8-hour average increased from 1988 to 1990, and decreased significantly in the mid 1990s. The number of days CO has exceeded the 8-hour guideline more than doubled from 1988 (six days) to 1992 (17 days), but has decreased since, oscillating between five and 12 days.
