California

Air Quality Index Report

The report below displays data on the total number of days in California with an Air Quality Index Value of over 100. This data has been compiled from 1990-2007. Some states have multiple monitoring stations and each will be listed in the reports below. Other states do not have any monitoring stations in which case we have selected the closest station available.

Year	Bakersfield	Fresno	Los Angeles-Long Beach	Oakland	Orange County	Riverside-San Bernardino	Sacramento	San Diego	San Francisco	San Jose	Ventura
1990	144	101	181	4	65	185	86	0	9	0	106
1991	142	107	170	4	53	173	74	0	6	0	120
1992	133	114	188	7	47	192	87	0	12	0	80
1993	133	97	156	11	39	189	45	1	12	0	63
1994	129	90	145	5	30	167	69	0	5	0	97
1995	133	91	124	13	20	154	61	3	16	0	100
1996	127	105	97	9	13	147	70	1	18	1	95
1997	94	118	65	2	8	131	39	0	2	1	75
1998	104	86	64	11	7	117	55	0	14	0	54
1999	161	164	71	20	7	151	93	11	5	0	54
2000	164	164	83	12	11	171	65	4	0	0	57
2001	158	186	105	15	6	183	72	12	4	1	52
2002	186	204	94	23	6	175	90	17	8	0	26
2003	169	167	106	13	15	158	66	3	9	0	47
2004	160	84	99	8	10	147	55	2	3	0	41
2005	122	95	60	6	0	141	58	2	3	0	36
2006	137	97	56	13	7	128	74	1	11	0	31
2007	131	93	59	5	9	135	32	2	0	1	22

According to the EPA, an Air Quality Index Value of over 100 presents some level of health concern. The higher the number, the higher the level of concern. The EPA provides the following table and more information on Air Quality Index can be found at WikiPedia.

Air Quality Index Values	Levels of Health Concern
0 to 50	Good
51 to 100	Moderate
101 to 150	Unhealthy for Sensitive Groups
151 to 200	Unhealthy
201 to 300	Very Unhealthy
301 to 500	Hazardous