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										1.65							
	Health Risk										8							
Benzene	Annual Avg	2.25	1.86	1.2	1.23	1.14	1.2	0.7	0.77	0.85	0.61							
	Health Risk	208	172	111	114	105	111	65	71	78	56							
"1,3-Butadiene"	Annual Avg	0.379	0.353	0.224	0.348	0.293	0.298	0.236	0.208	0.26	0.162							
	Health Risk	142	133	84	131	110	112	89	78	98	61							
Carbon Tetrachloride	Annual Avg	0.128	0.132		0.112		0.094	0.074		0.113								
	Health Risk	34	35		30		25	20		30								
"Chromium, Hexavalent"	Annual Avg										0.1							
	Health Risk										15							
para-Dichlorobenzene	Annual Avg		0.11	0.1	0.12	0.1	0.11	0.1	0.15									
	Health Risk		7	7	8	7	7	7	10									
Formaldehyde	Annual Avg										3.09							
	Health Risk										23
Methylene Chloride	Annual Avg	0.65	0.61	0.55	0.65	0.62	0.58	0.5	0.59	0.51	
	Health Risk	2	2	2	2	2	2	2	2	2	
Perchloroethylene	Annual Avg	0.145	0.15	0.118	0.109	0.087	0.053	0.044	0.052	0.035	
	Health Risk	6	6	5	4	3	2	2	2	1	
Diesel PM	Annual Avg										
	Health Risk										
Total Health Risk		392	355	209	289	227	259	185	163	209	163



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