High Pollution in Previous Years

Number of high pollution nights during previous years:

	1999	2000	2001	2002	2003	2004	2005	2006	2007
Rangiora	10	7				6	9	15	4
Kaiapoi			39	29	35	17	17	28	20
Christchurch (St. Albans)	50	31	51	28	35	36	32	27	14
Ashburton	13	16					18	25	13
Timaru	48	50	48	33	50	39	46	36	36
Waimate				1	6			10	0
Geraldine					5	3			2

Highest daily concentrations of PM10 during previous years:

	1999	2000	2001	2002	2003	2004	2005	2006	2007
Rangiora	87	97				78	99	138	107
Kaiapoi			153	138	163	99	152	161	104
Christchurch (St. Albans)	194	182	220	214	136	135	147	184	120
Ashburton	94	97					89	136	90
Timaru	152	162	154	107	155	117	109	190	120
Waimate				51	82			95	50
Geraldine					63	55			55

Second highest daily concentrations of PM10 during previous years:

	1999	2000	2001	2002	2003	2004	2005	2006	2007
Rangiora	77	95				67	78	102	73
Kaiapoi			126	126	116	89	94	145	90
Christchurch (St. Albans)	179	143	174	163	135	135	141	172	99
Ashburton	79	85					80	104	72
Timaru	109	142	131	106	122	110	107	130	99
Waimate				50	73			62	42
Geraldine					62	61			51