Table 4.4: Summary data for SO₂ monitoring in Canterbury

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	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001
One-hour average SO₂ concentrations, Christchurch (Packe Street)
% valid data	78%	64%	77%	55%	90%	99%	97%	97%	94%	93%
Hours > 350 gm^-3	0	0	0	0	0	0	0	0	0	0
99.9 %ile gm^-3	88	35	84	66	83	89	25	64	41	40
Maximum gm^-3	95	80	120	85	124	106	34	90	56	64
24-hour average SO₂ concentrations, Christchurch (Packe Street)
% valid data	72%	61%	76%	49%	87%	98%	96%	95%	93%	92%
Days > 120 gm^-3	0	0	0	0	0	0	0	0	0	0
99.9 %ile gm^-3	41	18	33	32	35	37	9	28	20	19
Maximum gm^-3	43	18	39	34	40	48	10	31	32	20
One-hour average SO₂ concentrations, Christchurch (Coles Place)
% valid data							42%	86%	100%	96%
Hours > 350 gm^-3							0	0	0	0
99.9 %ile gm^-3							43	42	43	47
Maximum gm^-3							61	67	82	65
24-hour average SO₂ concentrations, Christchurch (Coles Place)
% valid data							42%	85%	100%	94%
Days > 120 gm^-3							0	0	0	0
99.5 %ile gm^-3							13	17	18	20
Maximum gm^-3							15	23	19	20
One-hour average SO₂ concentrations, Christchurch (Opawa)
% valid data				52%	27%	96%	98%	48%
Hours > 350 gm^-3				0	0	0	0	0
99.9 %ile gm^-3				145	45	98	110	140
Maximum gm^-3				234	46	149	147	221
24-hour average SO₂ concentrations, Christchurch (Opawa)
% valid data				52%	27%	94%	98%	49%
Days > 120 gm^-3				0	0	0	0	0
99.5 %ile gm^-3				57	19	39	42	41
Maximum gm^-3				63	19	43	47	47
One-hour average SO₂ concentrations, Christchurch (Hornby)
% valid data				41%	95%	94%	98%	100%	76%	100%
Hours > 350 gm^-3				0	0	0	0	0	0	0
99.9 %ile gm^-3				183	114	204	145	228	225	234
Maximum gm^-3				235	162	252	195	298	294	334
24-hour average SO₂ concentrations, Christchurch (Hornby)
% valid data				41%	94%	93%	97%	99%	76%	100%
Days > 120 gm^-3				0	0	0	0	0	0	0
99.5 %ile gm^-3				53	39	75	52	69	79	87
Maximum gm^-3				56	42	100	59	87	90	104
One-hour average SO₂ concentrations, Timaru
% valid data						58%	100%	100%	92%	93%
Hours > 350 gm^-3						0	0	0	0	0
99.9 %ile gm^-3						74	55	72	45	47
Maximum gm^-3						92	111	165	123	72
24-hour average SO₂ concentrations, Timaru
% valid data						57%	100%	100%	92%	93%
Days > 120 gm^-3						0	0	0	0	0
99.5 %ile gm^-3						26	24	28	19	17
Maximum gm^-3						27	36	31	21	18
One-hour average SO₂ concentrations, Ashburton
% valid data								75%	99%	22%
Hours > 350 gm^-3								0	0	0
99.9 %ile gm^-3								26	25	13
Maximum gm^-3								42	37	27
24-hour average SO₂ concentrations, Ashburton
% valid data								74%	99%	21%
Days > 120 gm^-3								0	0	0
99.5 %ile gm^-3								8	9	3
Maximum gm^-3								9	12	3
One-hour average SO₂ concentrations, Rangiora
% valid data								94%	82%	14%
Hours > 350 gm^-3								0	0	0
99.9 %ile gm^-3								22	18	10
Maximum gm^-3								63	28	11
24-hour average SO₂ concentrations, Rangiora
% valid data								93%	81%	13%
Days > 120 gm^-3								0	0	0
99.5 %ile gm^-3								8	10	7
Maximum gm^-3								11	10	7
One-hour average SO₂ concentrations, Kaiapoi
% valid data										70%
Hours > 350 gm^-3										0
99.9 %ile gm^-3										17
Maximum gm^-3										55
24-hour average SO₂ concentrations, Kaiapoi
% valid data										69%
Days > 120 gm^-3										0
99.5 %ile gm^-3										7
Maximum gm^-3										8

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Table 4.4: Summary data for SO2 monitoring in Canterbury

Table 4.4: Summary data for SO₂ monitoring in Canterbury