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	1.83	1.6	2													
	Health Risk	9	9	8	10													
Benzene	Annual Avg	2.68	2.22	1.54	1.47													
	Health Risk	248	205	143	136													
"1,3-Butadiene"	Annual Avg	0.389	0.306	0.24	0.327													
	Health Risk	146	115	90	123													
Carbon Tetrachloride	Annual Avg	0.127	0.125		0.104													
	Health Risk	33	33		27													
"Chromium, Hexavalent"	Annual Avg			0.21	0.21													
	Health Risk			31	31													
para-Dichlorobenzene	Annual Avg			0.12	0.17													
	Health Risk			8	11													
Formaldehyde	Annual Avg	2.44	1.62	1.36	1.85													
	Health Risk	18	12	10	14
Methylene Chloride	Annual Avg	0.92	0.65	0.52	0.99
	Health Risk	3	2	2	3
Perchloroethylene	Annual Avg	0.087	0.127	0.075	1.48
	Health Risk	3	5	3	59
Diesel PM	Annual Avg				
	Health Risk				
Total Health Risk		460	381	295	414



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