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	1.87	2.54	1.86	2.19	2.08	0.89	1.84			1.36	1.49	1.58	1.66	1.66	1.59	1.7	0.97
	Health Risk	9	12	9	11	10	4	9			7	7	8	8	8	8	8	5
Benzene	Annual Avg	2.55	2.22	1.9	1.77	2.01	1.45	1.03			0.87	0.85	0.685		0.623	0.526	0.505	0.42
	Health Risk	236	206	176	164	186	134	95			80	79	63		58	49	47	39
"1,3-Butadiene"	Annual Avg	0.34	0.312	0.292	0.379	0.363	0.332	0.267			0.208	0.193	0.175		0.118	0.121	0.112	0.083
	Health Risk	128	117	110	143	136	125	100			78	72	66		44	45	42	31
Carbon Tetrachloride	Annual Avg	0.131	0.136				0.102	0.079				0.096	0.086		0.093			
	Health Risk	34	36				27	21				25	23		24			
"Chromium, Hexavalent"	Annual Avg			0.33	0.33	0.36	0.38	0.22			0.19	0.35		0.41	0.348			
	Health Risk			50	50	55	56	33			29	52		62	52			
para-Dichlorobenzene	Annual Avg		0.13	0.13	0.16	0.12	0.17	0.11				0.14	0.15		0.17	0.16	0.15	0.15
	Health Risk		9	8	10	8	11	7				9	10		12	11	10	10
Formaldehyde	Annual Avg	1.75	2.7	1.53	2.73	2.5	2.65	4.15			3.55	3.17	4.73	4.36	4.18	3.46	3.47	2.55
	Health Risk	13	20	11	20	18	19	31			26	23	35	32	31	25	26	19
Methylene Chloride	Annual Avg		0.69	0.6	1.1	0.93	0.98	0.83			0.58	0.69	0.44		0.45	0.29	0.3	0.18
	Health Risk		2	2	4	3	3	3			2	2	2		2	1	1	<1
Perchloroethylene	Annual Avg	0.237	0.276	0.201	0.198	0.191	0.177	0.175				0.129	0.112		0.06	0.051	0.046	0.038
	Health Risk	9	11	8	8	8	7	7				5	4		2	2	2	1
Diesel PM	Annual Avg																	
	Health Risk																	
Total Health Risk		429	413	374	410	424	386	306			222	274	211	102	233	141	136	105