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	1.33	1.5	1.22	1.41	1.48	0.64	1.03	1	0.86	1.04	0.84	0.95	0.97	0.89	0.89	1.01	0.85
	Health Risk	6	7	6	7	7	3	5	5	4	5	4	5	5	4	4	5	4
Benzene	Annual Avg	2.25	1.7	1.48	1.16	1.39	0.98	0.76	0.76	0.76	0.86	0.65	0.505	0.491	0.483	0.371	0.404	0.362
	Health Risk	208	158	137	107	129	90	71	70	70	79	60	47	45	45	34	37	34
"1,3-Butadiene"	Annual Avg	0.333	0.257	0.258	0.312	0.307	0.242	0.208	0.198	0.196	0.22	0.159	0.136	0.12	0.089	0.074	0.073	0.068
	Health Risk	125	97	97	117	115	91	78	75	74	83	60	51	45	33	28	27	26
Carbon Tetrachloride	Annual Avg	0.132	0.127		0.103		0.099	0.077				0.094	0.086	0.092	0.093			
	Health Risk	35	34		27		26	20				25	23	24	25			
"Chromium, Hexavalent"	Annual Avg			0.24	0.19	0.16	0.18	0.11	0.11	0.1	0.1	0.1		0.045	0.05	0.03	0.043	0.05
	Health Risk			36	28	23	27	16	16	15	15	15		7	8	5	6	8
para-Dichlorobenzene	Annual Avg		0.1	0.11	0.13	0.15	0.12	0.11	0.13				0.15	0.15	0.15	0.15	0.15	0.15
	Health Risk		7	8	8	10	8	7	8				10	10	10	10	10	10
Formaldehyde	Annual Avg	1.64	1.53	1.26	1.76	2.25	2.13	2.62	2.62	2.27	2.67	2.23	2.59	2.99	2.68	2.19	2.42	2.08
	Health Risk	12	11	9	13	17	16	19	19	17	20	16	19	22	20	16	18	15
Methylene Chloride	Annual Avg	0.59	0.83	1.34	1.13	0.73	0.63	0.59	0.57		0.53	0.76	0.17	0.16	0.16	0.13	0.14	0.14
	Health Risk	2	3	5	4	3	2	2	2		2	3	<1	<1	<1	<1	<1	<1
Perchloroethylene	Annual Avg	0.282	0.269	0.263	0.2	0.207	0.249	0.147	0.125			0.089	0.061	0.06	0.047	0.037	0.041	0.037
	Health Risk	11	11	11	8	8	10	6	5			4	2	2	2	1	2	1
Diesel PM3	Annual Avg	(2.9)					(1.9)					(1.4)						
	Health Risk	(870)					(570)					(420)						
Average Basin Risk	w/o Diesel PM	399	328	309	319	312	273	224	200	180	204	187	157	160	147	98	105	98
	w/ Diesel PM	(1269)					(843)					(607)						
																		




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