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	2.46	3	2.46	2.67	2.3	0.97	2.08	1.77	1.54	1.63	1.26	1.47	1.41	1.47	1.46	1.79	1.17
	Health Risk	12	15	12	13	11	5	10	9	7	8	6	7	7	7	7	9	6
Benzene	Annual Avg	3.42	2.91	2.61	2.17	2.4	1.89	1.45	1.34	1.25	1.2	0.97	0.86	0.769	0.745	0.589	0.634	0.504
	Health Risk	317	269	242	201	222	175	134	124	116	111	90	80	71	69	55	59	47
"1,3-Butadiene"	Annual Avg	0.532	0.452	0.498	0.565	0.497	0.459	0.39	0.378	0.354	0.328	0.251	0.251	0.211	0.147	0.143	0.137	0.111
	Health Risk	200	170	187	212	187	173	146	142	133	123	94	94	79	55	54	51	42
Carbon Tetrachloride	Annual Avg	0.136	0.134		0.105		0.102	0.079		0.114		0.096	0.086	0.092	0.093			
	Health Risk	36	35		28		27	21		30		25	23	24	25			
"Chromium, Hexavalent"	Annual Avg			0.39	0.29	0.29	0.46	0.18	0.17	0.15	0.14	0.18		0.179	0.158	0.126	0.139	0.139
	Health Risk			59	43	43	69	27	25	22	22	27		27	24	19	21	21
para-Dichlorobenzene	Annual Avg		0.17	0.19	0.17	0.13	0.17	0.11	0.13			0.13	0.15	0.16	0.17	0.16	0.15	0.15
	Health Risk		11	13	11	8	11	7	9			9	10	11	11	11	10	10
Formaldehyde	Annual Avg	2.92	3.08	2.22	3.22	3.14	3.57	5.06	4.47	3.79	4.06	3.13	4.13	4.16	3.83	3.76	4.21	3.58
	Health Risk	22	23	16	24	23	26	37	33	28	30	23	30	31	28	28	31	26
Methylene Chloride	Annual Avg	1.86	1.51	0.9	1.23	1.1	1.28	0.95	1.14	0.85	0.92	0.83	0.63	0.57	0.59	0.57	0.57	0.32
	Health Risk	6	5	3	4	4	4	3	4	3	3	3	2	2	2	2	2	1
Perchloroethylene	Annual Avg	0.576	0.547	0.412	0.448	0.393	0.364	0.32	0.274	0.259		0.207	0.176	0.146	0.105	0.082	0.08	0.062
	Health Risk	23	22	16	18	16	15	13	11	10		8	7	6	4	3	3	2
Diesel PM3	Annual Avg	(3.6)					(2.7)					(2.4)						
	Health Risk	(1080)					(810)					(720)						
Average Basin Risk	w/o Diesel PM	616	550	548	554	514	505	398	357	349	297	285	253	258	225	179	186	155
	w/ Diesel PM	(1696)					(1315)					(1005)						
South Coast