Table 4.2: Summary of PM₁₀ concentrations at ambient monitoring sites in the Waikato region

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Area	24-hour maximum	24-hour 99.5 percentile	Annual average	% days monitored	Days > 50 µgm-3	% of winter days guideline was exceeded
Hamilton - 1998	35	33	15	47%	0	0
Hamilton - 1999	44	42	16	99%	0	0
Hamilton - 2000	43	33	15	91%	0	0
Hamilton - 2001	67	53	14	70%	2 measured 3 equivalent*	3%
Te Kuiti - 1998	42	42	16	53%	0	0
Tokoroa - 2001	75	66	26	47%	13 measured 24 equivalent*	20%
Taupo - 2001	57	54	18	15%	1 measured 2 equivalent*	2%

Note: Guideline value exceedences are highlighted in bold.

* This is an estimate of the number of days PM₁₀ concentrations may have exceeded the guideline value if monitoring had been carried out on all days during winter (May to August inclusive). It is extrapolated from the number of measured exceedences and the number of days when monitoring did occur.