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	2.12	3.28	2.36	2.84	2.42	1.09	2.13										
	Health Risk	10	16	11	14	12	5	10										
Benzene	Annual Avg	2.73	2.7	2.14	1.92	2.15	1.62	1.11	1.11									
	Health Risk	253	250	198	178	199	150	103	103									
"1,3-Butadiene"	Annual Avg	0.348	0.341	0.308	0.391	0.336	0.312	0.257	0.254									
	Health Risk	131	128	116	147	126	117	97	95									
Carbon Tetrachloride	Annual Avg	0.133	0.137		0.103		0.1	0.075										
	Health Risk	35	36		27		26	20										
"Chromium, Hexavalent"	Annual Avg			0.22	0.16	0.16	0.2	0.12										
	Health Risk			33	24	24	30	17										
para-Dichlorobenzene	Annual Avg		0.13	0.14	0.14	0.1	0.13	0.1	0.14									
	Health Risk		9	9	9	7	9	7	9									
Formaldehyde	Annual Avg	2.35	3.34	1.98	3.25	2.67	3.21	5.2										
	Health Risk	17	25	15	24	20	24	38	
Methylene Chloride	Annual Avg	1.41	1.59	0.82	0.87	0.72	1.13	0.66	1.7
	Health Risk	5	6	3	3	3	4	2	6
Perchloroethylene	Annual Avg	0.423	0.717	0.364	0.398	0.286	0.263	0.199	0.206
	Health Risk	17	29	15	16	11	11	8	8
Diesel PM	Annual Avg								
	Health Risk								
Total Health Risk		468	499	400	442	402	376	302	221