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										0.55							
	Health Risk										3							
Benzene	Annual Avg									0.56	0.42							
	Health Risk									52	39							
"1,3-Butadiene"	Annual Avg									0.148	0.118							
	Health Risk									56	45							
Carbon Tetrachloride	Annual Avg																	
	Health Risk																	
"Chromium, Hexavalent"	Annual Avg										0.1							
	Health Risk										15							
para-Dichlorobenzene	Annual Avg																	
	Health Risk																	
Formaldehyde	Annual Avg										1.24							
	Health Risk										9
Methylene Chloride	Annual Avg										
	Health Risk										
Perchloroethylene	Annual Avg										
	Health Risk										
Diesel PM	Annual Avg										
	Health Risk										
Total Health Risk										108	111
											

Contra Costa											
San Pablo-El Portal