Table 5.2: Summary of PM₁₀ concentrations at ambient monitoring sites (24-hour average)

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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
Rotorua 1998	52	40	14	100%	1	0.8%
Rotorua 1999	43	35	14	99%	0	0
Rotorua 2000	36	32	12	98%	0	0
Rotorua 2001	38	37	12	98%	0	0
Tauranga 1998	32	29	14	100%	0	0
Tauranga 1999	34	31	13	100%	0	0
Tauranga 2000	29	26	13	97%	0	0
Tauranga 2001	28	23	12	89%	0	0
Whakatane 1998	53	48	19	17%	1 measured 6 equivalent*	5%
Whakatane 1999	38	37	16	17%	0	0
Whakatane 2000	31	31	14	17%	0	0
Whakatane 2001	45	41	13	16%	0	0
Pongakawa 1998	44	41	12	15%	0	0
Pongakawa 1999	28	26	11	16%	0	0
Pongakawa 2000	45	41	13	15%	0	0
Pongakawa 2001	49	42	11	16%	0	0

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.