Table 3.5: Summary data for NO₂ monitoring in Christchurch

	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001
One-hour average NO₂ concentrations (Packe Street)
% valid data	68%	65%	57%	84%	98%	98%	94%	92%	82%	97%
Hours >200 gm^-3	0	0	0	0	0	0	0	0	0	0
99.9 %ile gm^-3	149	113	77	88	67	91	65	66	62	92
Maximum gm^-3	162	124	85	132	200	119	93	112	108	106
24-hour average NO₂ concentrations, St Albans (Packe Street)
% valid data	64%	63%	55%	77%	94%	97%	93%	90%	80%	96%
Days >100 gm^-3	0	0	0	0	0	0	0	0	0	0
99.5 %ile gm^-3	75	50	39	46	40	45	33	35	34	48
Maximum gm^-3	89	54	43	51	41	50	34	37	37	52
One-hour average NO₂ concentrations, St Albans (Coles Place)
% valid data							42%	92%	6%	55%
Hours >200 gm^-3							0	0		0
99.9 %ile gm^-3							49	97		93
Maximum gm^-3							61	161		110
24-hour average NO₂ concentrations, St Albans (Coles Place)
% valid data							42%	91%	6%	54%
Days > 100 gm^-3							0	0	0	0
99.5 %ile gm^-3							26	44		46
Maximum gm^-3							30	54		46

Table 3.5: Summary data for NO2 monitoring in Christchurch