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	1.1	1.21	0.99	1.16	1.32	0.64	0.83	0.91	0.7	0.91	0.75	0.78	0.75	0.72	0.74	0.86	0.71
	Health Risk	5	6	5	6	6	3	4	4	3	4	4	4	4	3	4	4	3
Benzene	Annual Avg	2	1.21	1.03	0.8	1.08	0.81		0.63	0.61		0.55	0.421	0.419		0.341	0.358	
	Health Risk	186	112	95	74	100	75		58	56		51	39	39		32	33	
"1,3-Butadiene"	Annual Avg	0.278	0.183	0.184	0.225	0.262	0.205		0.162	0.153		0.136	0.11	0.107		0.07	0.064	
	Health Risk	105	69	69	85	98	77		61	57		51	41	40		26	24	
Carbon Tetrachloride	Annual Avg	0.132	0.129		0.101		0.097					0.093	0.086	0.091				
	Health Risk	35	34		27		26					25	23	24				
"Chromium, Hexavalent"	Annual Avg			0.24	0.2	0.17	0.2	0.11	0.1	0.1	0.11	0.1		0.05	0.063	0.03	0.038	0.03
	Health Risk			37	30	25	29	16	15	15	16	16		8	9	5	6	5
para-Dichlorobenzene	Annual Avg		0.1	0.11	0.13	0.12	0.11		0.13				0.15	0.15		0.15	0.15	
	Health Risk		7	7	8	8	7		8				10	10		10	10	
Formaldehyde	Annual Avg	1.26	1.3	1.1	1.46	2.08	1.81	2.1	2.37	2	2.49	2.14	2.54	2.56	2.3	1.93	2.08	1.88
	Health Risk	9	10	8	11	15	13	15	17	15	18	16	19	19	17	14	15	14
Methylene Chloride	Annual Avg	0.58	0.59	0.81	1.01	0.57	0.57		0.62			0.65	0.16	0.13		0.12	0.13	
	Health Risk	2	2	3	3	2	2		2			2	<1	<1		<1	<1	
Perchloroethylene	Annual Avg	0.236	0.229	0.208	0.144	0.132	0.146		0.103			0.078	0.057	0.048		0.031	0.036	
	Health Risk	9	9	8	6	5	6		4			3	2	2		1	1	
Diesel PM	Annual Avg																	
	Health Risk																	
Total Health Risk		351	249	232	250	259	238	35	169	146	38	168	138	146	29	92	93	22