Table 2.6: Summary data for CO monitoring in the Canterbury region

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	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001
One-hour average CO concentrations, St Albans, Christchurch (Packe Street)
% valid data	81%	79%	92%	91%	99%	95%	99%	98%	96%	98%
Hours > 30 mgm^-3	3	5	7	0	0	0	0	0	0	0
Days > guideline	1	3	3	0	0	0	0	0	0	0
99.9 %ile mgm^-3	28	30	26	19	18	21	16	19	14	16
Maximum mgm^-3	34	38	41	25	27	27	20	25	20	20
Eight-hour average CO concentrations, St Albans, Christchurch (Packe Street)
% valid data	80%	78%	92%	91%	98%	95%	99%	98%	96%	98%
Hours > 10 mgm^-3	141	103	51	43	30	97	25	67	17	39
Days > guideline	17	13	4	9	7	11	5	12	3	7
99.9 %ile mgm^-3	24	20	23	12	12	18	12	17	11	14
Maximum mgm^-3	29	22	28	14	20	20	13	21	16	16
One-hour average CO concentrations, St Albans, Christchurch (Coles Place)
% valid data							41%	87%	100%	99%
Hours > 30 mgm^-3							0	0	0	0
99.9 %ile mgm^-3							18	16	12	13
Maximum mgm^-3							22	21	18	16
Eight-hour average CO concentrations, St Albans, Christchurch (Coles Place)
% valid data							41%	87%	100%	99%
Hours > 10 mgm^-3							77	47	10	13
Days > guideline							9	9	3	3
99.9 %ile mgm^-3							13	14	10	10
Maximum mgm^-3							14	18	13	12
One-hour average CO concentrations, Beckenham, Christchurch
% valid data				52%	100%	23%
Hours > 30 mgm^-3				0	0	0
99.9 %ile mgm^-3				10	10	2
Maximum mgm^-3				13	15	4
Eight-hour average CO concentrations, Beckenham, Christchurch
% valid data				52%	100%	23%
Hours > 10 mgm^-3				0	0	0
99.9 %ile mgm^-3				8	8	1
Maximum mgm^-3				8	9	1
One-hour average CO concentrations, Hornby, Christchurch
% valid data				53%	100%	99%	100%	97%	90%	26%
Hours > 30 mgm^-3				0	0	0	0	0	0	0
99.9 %ile mgm^-3				8	7	8	6	8	7	2
Maximum mgm^-3				9	29	12	12	11	9	3
Eight-hour average CO concentrations, Hornby, Christchurch
% valid data				53%	100%	99%	100%	96%	90%	26%
Hours > 10 mgm^-3				0	5	0	0	0	0	0
Days > guideline				0	1	0	0	0	0	0
99.9 %ile mgm^-3				6	7	6	4	6	4	1
Maximum mgm^-3				7	12	7	5	7	5	1
One-hour average CO concentrations, Ashburton
% valid data								86%	100%	24%
Hours > 10 mgm^-3								0	0	0
99.9 %ile mgm^-3								6	5	1
Maximum mgm^-3								10	9	1
Eight-hour average CO concentrations, Ashburton
% valid data								85%	100%	24%
Hours > 10 mgm^-3								0	0	0
99.9 %ile mgm^-3								3	3	0
Maximum mgm^-3								4	4	0
One-hour average CO concentrations, Rangiora
% valid data								84%	100%	18%
Hours > 30 mgm^-3								0	0	0
99.9 %ile mgm^-3								6	5	1
Maximum mgm^-3								9	9	1
Eight-hour average CO concentrations, Rangiora
% valid data								84%	100%	18%
Hours > 10 mgm^-3								0	0	0
99.9 %ile mgm^-3								4	4	0
Maximum mgm^-3								4	5	0
One-hour average CO concentrations, Kaiapoi
% valid data										78%
Hours > 30 mgm^-3										0
99.9 %ile mgm^-3										7
Maximum mgm^-3										9
Eight-hour average CO concentrations, Kaiapoi
% valid data										78%
Hours > 10 mgm^-3										0
99.9 %ile mgm^-3										5
Maximum mgm^-3										6

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