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						0.49	1.59	1.22	1.27	1.69	1.19	1.27	1.37	1.51		1.65	1.43
	Health Risk						2	8	6	6	8	6	6	7	7		8	7
Benzene	Annual Avg						1.14	0.78	0.57	0.7	0.71	0.58	0.549	0.506	0.405		0.355	0.383
	Health Risk						106	72	53	65	66	54	51	47	37		33	35
"1,3-Butadiene"	Annual Avg						0.206	0.211	0.16	0.2	0.153	0.126	0.138	0.099	0.063		0.062	0.063
	Health Risk						78	79	60	75	58	47	52	37	24		23	24
Carbon Tetrachloride	Annual Avg						0.099	0.079				0.094	0.086	0.092	0.095			
	Health Risk						26	21				25	23	24	25			
"Chromium, Hexavalent"	Annual Avg						0.26	0.13	0.1	0.1	0.1	0.1		0.078	0.053		0.045	0.03
	Health Risk						39	19	15	15	16	16		12	8		7	5
para-Dichlorobenzene	Annual Avg						0.11	0.11	0.12			0.11	0.13	0.15	0.15		0.15	0.15
	Health Risk						7	7	8			7	9	10	10		10	10
Formaldehyde	Annual Avg						1.92	3.48	3.12	2.99	3.67	2.79	3.44	3.15	3.43		2.61	2.77
	Health Risk						14	26	23	22	27	21	25	23	25		19	20
Methylene Chloride	Annual Avg						0.54	0.64	0.5		0.5	0.58	0.26	0.1	0.11		0.09	0.09
	Health Risk						2	2	2		2	2	<1	<1	<1		<1	<1
Perchloroethylene	Annual Avg						0.092	0.119	0.039			0.065	0.058	0.047	0.037		0.043	0.056
	Health Risk						4	5	2			3	2	2	1		2	2
Diesel PM	Annual Avg																	
	Health Risk																	
Total Health Risk							278	239	169	183	177	181	168	162	137		102	103
																		

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