Table 8.2: Summary of PM₁₀ concentrations at ambient monitoring sites in the Wellington 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
Newtown, Wellington 1998	18	18	n/a	10%	0
Rural Otaki 1999	50	48	n/a	14%	1 measured 9 equivalent2
Lower Hutt Huia Street 1998	38	33	13	65%	0
Lower Hutt Huia Street 1999	20	19	11	40%	0
Lower Hutt Birch Lane 2001	30	26	n/a1	17%	0
Upper Hutt 2000	52	49	14	57%	2 measured	2%
Upper Hutt 2001	61	57	14	56%	4 measured	3%
Wainuiomata 2001	57	57	13	22%	3 measured 10 equivalent2	10%
Masterton 1999	87	74	16	87%	8 measured 11 equivalent2	9%

Note: Guideline value exceedences are highlighted in bold.

1 Although more than 15% of data were available, all data were for winter months.

2 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.