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					0.96	0.25	0.9	0.93	0.88		0.77	0.39	0.95	0.93	0.87	0.89	0.84
	Health Risk					5	1	4	4	4		4	2	5	5	4	4	4
Benzene	Annual Avg					0.91	0.75	0.44	0.46	0.45	0.48	0.39	0.344	0.343	0.363	0.278	0.244	0.239
	Health Risk					84	70	40	42	42	44	36	32	32	34	26	23	22
"1,3-Butadiene"	Annual Avg					0.194	0.167	0.135	0.121	0.138	0.107	0.096	0.093	0.078	0.078	0.054	0.051	0.045
	Health Risk					73	63	51	46	52	40	36	35	29	29	20	19	17
Carbon Tetrachloride	Annual Avg						0.099	0.077				0.094	0.087	0.093	0.093			
	Health Risk						26	20				25	23	24	25			
"Chromium, Hexavalent"	Annual Avg					0.13	0.19	0.11	0.1	0.1	0.1	0.1		0.048	0.053	0.06	0.058	0.045
	Health Risk					19	29	16	15	15	15	15		7	8	9	9	7
para-Dichlorobenzene	Annual Avg					0.28	0.17	0.1	0.15			0.1	0.13	0.15	0.15	0.15	0.15	0.15
	Health Risk					19	11	7	10			7	9	10	10	10	10	10
Formaldehyde	Annual Avg					1.71	1.78	2.52	2.42	2.42		2.25	1.57	3.12	3.23	2.12	2.07	2.45
	Health Risk					13	13	19	18	18		17	12	23	24	16	15	18
Methylene Chloride	Annual Avg					0.82	0.54	0.5	0.5			0.52	0.23	0.08	0.09	0.06	0.08	0.06
	Health Risk					3	2	2	2			2	<1	<1	<1	<1	<1	<1
Perchloroethylene	Annual Avg					0.065	0.051	0.061	0.063			0.047	0.031	0.026	0.022	0.016	0.014	0.019
	Health Risk					3	2	2	3			2	1	1	<1	<1	<1	<1
Diesel PM	Annual Avg																	
	Health Risk																	
Total Health Risk						219	217	161	140	131	99	144	114	131	135	85	80	78