Table 10.2: Summary of PM₁₀ concentrations at ambient monitoring sites in Canterbury

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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
St Albans Packe Street 1994	283	192	n/a¹	61%	19 measured 23 equivalent²	18%
St Albans Packe Street 1995	161	116	21	96%	31 measured 33 equivalent²	26%
St Albans Packe Street 1996	139	102	21	96%	28 measured 30 equivalent²	24%
St Albans Packe Street 1997	211	173	22	95%	27 measured 31 equivalent²	25%
St Albans Packe Street 1998	155	127	23	99%	27 measured	22%
St Albans Packe Street 1999	152	139	23	97%	27 measured	22%
St Albans Packe Street 2000	96	84	18	67%	9 measured 18 equivalent²	15%
St Albans Packe Street 2001	129	122	22	46%	13 measured 31 equivalent²	25%
St Albans Coles Place 1998	83	82	n/a¹	38%	2 measured 12 equivalent²	10%
St Albans Coles Place 1999	158	140	23	99%	31 measured	25%
St Albans Coles Place 2000	154	105	19	100%	21 measured	17%
St Albans Coles Place 2001	183	130	23	93%	39 measured 40 equivalent²	32%
Beckenham 1995	81	54	16	50%	3 measured 4 equivalent²	3%
Beckenham 1996	106	81	15	99%	8 measured	7%
Hornby 1995	71	60	19	51%	3 measured 6 equivalent²	5%
Hornby 1996	75	51	16	99%	2 measured	2%
Hornby 1997	80	64	22	98%	13 measured 13 equivalent²	11%
Hornby 1998	75	64	22	87%	13 measured 13 equivalent²	11%
Opawa 1995	137	134	n/a	41%	28 measured 44 equivalent²	36%
Opawa 1996	148	140	n/a	29%	23 measured 49 equivalent²	40%
Opawa 1997	150	108	22	85%	22 measured 18 equivalent²	15%
Opawa 1998	196	97	23	98%	21 measured	17%
Timaru 1997	95	70	23	79%	21 measured 23 equivalent²	18%
Timaru 1998	89	80	25	77%	27 measured	22%
Timaru 1999	108	77	23	99%	32 measured	26%
Timaru 2000	111	94	23	100%	31 measured	25%
Timaru 2001	100	92	23	100%	29 measured	24%
Ashburton 1999	67	55	18	98%	5 measured	4%
Ashburton 2000	72	56	18	99%	4 measured	4%
Rangiora 1999	57	54	15	85%	4 measured	3%
Rangiora 2000	74	55	14	100%	3 measured	2%
Kaiapoi 2001	97	87	23	78%	25 measured	20%

Note: Guideline value exceedences are highlighted in bold.

1 Annual averages were not calculated because of seasonal bias in the data,

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.

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Table 10.2: Summary of PM10 concentrations at ambient monitoring sites in Canterbury

Table 10.2: Summary of PM₁₀ concentrations at ambient monitoring sites in Canterbury