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														0.84	0.82	0.78	0.82
	Health Risk														4	4	4	4
Benzene	Annual Avg														0.577	0.502	0.414	0.383
	Health Risk														53	46	38	36
"1,3-Butadiene"	Annual Avg														0.131	0.137	0.104	0.091
	Health Risk														49	51	39	34
Carbon Tetrachloride	Annual Avg														0.096			
	Health Risk														25			
"Chromium, Hexavalent"	Annual Avg														0.098	0.1		0.053
	Health Risk														15	15		8
para-Dichlorobenzene	Annual Avg														0.15	0.15	0.15	0.15
	Health Risk														10	10	10	10
Formaldehyde	Annual Avg														2.79	2.13	1.71	1.88
	Health Risk														21	16	13	14
Methylene Chloride	Annual Avg														0.19	0.16	0.13	0.14
	Health Risk														<1	<1	<1	<1
Perchloroethylene	Annual Avg														0.04	0.037	0.032	0.029
	Health Risk														2	1	1	1
Diesel PM	Annual Avg																	
	Health Risk																	
Total Health Risk															179	143	105	107


Santa Clara																		
San Jose-Jackson Street