Table 9.2: Summary of PM₁₀ concentrations at ambient monitoring sites in Nelson, Tasman and Marlborough

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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
Nelson Fire Station 2000	142	139	n/a1	15%	27 measured 66 equivalent2	54%
Nelson Swift Suzuki 2001	165	156	36	70%	81	66%
Richmond 2000	111	111	n/a1	15%	23 measured 60 equivalent2	49%
Nelson Vincent Street Kindergarten 2001	94	91	n/a	14%	10 measured 35 equivalent2	29%
Nelson Waimea Road 2001	81	65	26	59%	12 measured	10%
Blenheim 2000	56	51	19	15%	1 measured 6 equivalent2	5%
Blenheim 2001	38	38	17	20%	0	0
Picton 2000	27	27	n/a	10%	0	0

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.