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	1.73	1.97	1.54	1.76	1.52	0.61	1.34	1.16	1.08	1.29	1	1.1	1.18	1.19	1.12	1.32	1.03
	Health Risk	8	10	7	9	7	3	6	6	5	6	5	5	6	6	5	6	5
Benzene	Annual Avg	2.57	2.14	1.71	1.5	1.58	1.31	0.93	0.85	0.86	0.85	0.71	0.608	0.625	0.565	0.461	0.478	0.41
	Health Risk	238	198	158	139	146	121	86	79	80	79	66	56	58	52	43	44	38
"1,3-Butadiene"	Annual Avg	0.412	0.341	0.32	0.392	0.343	0.31	0.262	0.234	0.245	0.225	0.183	0.174	0.172	0.117	0.107	0.101	0.085
	Health Risk	155	128	120	147	129	117	99	88	92	85	69	65	65	44	40	38	32
Carbon Tetrachloride	Annual Avg	0.131	0.128		0.106		0.1	0.078		0.114		0.094	0.087	0.091	0.094			
	Health Risk	34	34		28		26	21		30		25	23	24	25			
"Chromium, Hexavalent"	Annual Avg			0.27	0.22	0.21	0.29	0.13	0.12	0.11	0.11	0.13	0.13	0.101	0.094	0.088	0.091	0.079
	Health Risk			40	33	31	43	20	18	17	17	19	19	15	14	13	14	12
para-Dichlorobenzene	Annual Avg		0.14	0.14	0.14	0.13	0.14	0.12	0.14			0.12	0.14	0.16	0.16	0.16	0.15	0.15
	Health Risk		9	9	9	8	9	8	9			8	10	10	10	10	10	10
Formaldehyde	Annual Avg	2.18	2.07	1.65	2.08	2.18	2.93	3.38	2.89	2.64	3.2	2.55	3.18	3.5	3.15	2.69	2.86	2.67
	Health Risk	16	15	12	15	16	22	25	21	19	24	19	23	26	23	20	21	20
Methylene Chloride	Annual Avg	1.09	1.27	0.75	0.93	0.79	0.77	0.66	0.66	0.62	0.66	0.67	0.36	0.28	0.28	0.25	0.25	0.18
	Health Risk	4	4	3	3	3	3	2	2	2	2	2	1	1	1	<1	<1	<1
Perchloroethylene	Annual Avg	0.277	0.271	0.21	0.27	0.18	0.166	0.134	0.116	0.114		0.115	0.089	0.077	0.057	0.046	0.047	0.039
	Health Risk	11	11	8	11	7	7	5	5	5		5	4	3	2	2	2	2
Diesel PM3	Annual Avg	(3.0)					(2.2)					(1.8)						
	Health Risk	(900)					(660)					(540)						
Average State Risk	w/o Diesel PM	466	409	357	394	347	351	272	228	250	213	218	206	208	177	133	135	119
	w/ Diesel PM	(1366)					(1011)					(758)