California Air Resources Board 2008 Almanac (web)																		
Annual Average Concentrations and Health Risks																		
TAC	Conc.1/Risk2	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001	2002	2003	2004	2005	2006
Acetaldehyde	Annual Avg	2.49	2.52		2.36	2.18	0.81		1.43			1.16	1.11		1.06	1.19	1.39	0.91
	Health Risk	12	12		11	11	4		7			6	5		5	6	7	4
Benzene	Annual Avg	3.53	2.45	2.6	1.99	2.04	1.69		1.24	1.16	1.11	1		0.705	0.705	0.554		0.484
	Health Risk	327	227	241	185	188	157		115	108	103	92		65	65	51		45
"1,3-Butadiene"	Annual Avg	0.592	0.439	0.523	0.575	0.447	0.448		0.364	0.339	0.323	0.278		0.198	0.142	0.144		0.113
	Health Risk	223	165	197	216	168	169		137	127	121	104		75	53	54		42
Carbon Tetrachloride	Annual Avg	0.139	0.129				0.099			0.118		0.097		0.092	0.092			
	Health Risk	37	34				26			31		26		24	24			
"Chromium, Hexavalent"	Annual Avg			0.44	0.34	0.22	0.25		0.15	0.11	0.12	0.12		0.078		0.09	0.1	0.088
	Health Risk			66	51	33	38		22	16	18	18		12		14	15	13
para-Dichlorobenzene	Annual Avg		0.17	0.26	0.19	0.12	0.17		0.16			0.13		0.18	0.2	0.15		0.15
	Health Risk		11	17	13	8	11		10			8		12	13	10		10
Formaldehyde	Annual Avg	2.97	2.76		3.22	3.06	3.29		3.68			2.88	2.96		2.79	2.78	2.91	2.41
	Health Risk	22	20		24	23	24		27			21	22		21	20	21	18
Methylene Chloride	Annual Avg	2.05	0.88	1	1.15	0.84	0.98		0.74	0.6		0.65		0.27	0.31	0.24		0.21
	Health Risk	7	3	3	4	3	3		3	2		2		<1	1	<1		<1
Perchloroethylene	Annual Avg	0.477	0.355	0.349	0.433	0.321	0.318		0.227	0.193		0.168		0.095	0.076	0.057		0.054
	Health Risk	19	14	14	17	13	13		9	8		7		4	3	2		2
Diesel PM	Annual Avg																	
	Health Risk																	
Total Health Risk		647	486	538	521	447	445		330	292	242	284	27	192	185	157	43	134