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	1.32																
	Health Risk	6																
Benzene	Annual Avg	2.08	1.85	1.41														
	Health Risk	192	171	130														
"1,3-Butadiene"	Annual Avg	0.353	0.302	0.307														
	Health Risk	133	114	115														
Carbon Tetrachloride	Annual Avg	0.124	0.123															
	Health Risk	33	32															
"Chromium, Hexavalent"	Annual Avg																	
	Health Risk																	
para-Dichlorobenzene	Annual Avg			0.11														
	Health Risk			7														
Formaldehyde	Annual Avg	1.66																
	Health Risk	12		
Methylene Chloride	Annual Avg	0.76	0.54	0.5
	Health Risk	3	2	2
Perchloroethylene	Annual Avg	0.095	0.094	0.076
	Health Risk	4	4	3
Diesel PM	Annual Avg			
	Health Risk			
Total Health Risk		383	323	257