Appendix C	Santa Clara County: San Jose - Jackson Street Air Quality and Health Risk													Table C-33			

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
Acetaldehyde	Annual Avg	 	 	 	 	 	 	 	 	 	 	 	 	 	0.84	0.82	0.78
	Health Risk	 	 	 	 	 	 	 	 	 	 	 	 	 	4	4	4
Benzene	Annual Avg	 	 	 	 	 	 	 	 	 	 	 	 	 	0.577	0.502	0.414
	Health Risk	 	 	 	 	 	 	 	 	 	 	 	 	 	53	46	38
"1,3-Butadiene"	Annual Avg	 	 	 	 	 	 	 	 	 	 	 	 	 	0.131	0.137	0.104
	Health Risk	 	 	 	 	 	 	 	 	 	 	 	 	 	49	51	39
Carbon Tetrachloride	Annual Avg	 	 	 	 	 	 	 	 	 	 	 	 	 	0.096	 	
	Health Risk	 	 	 	 	 	 	 	 	 	 	 	 	 	25	 	
"Chromium, Hexavalent"	Annual Avg	 	 	 	 	 	 	 	 	 	 	 	 	 	0.098	0.1	 
	Health Risk	 	 	 	 	 	 	 	 	 	 	 	 	 	15	15	 
para-Dichlorobenzene	Annual Avg	 	 	 	 	 	 	 	 	 	 	 	 	 	0.15	0.15	0.15
	Health Risk	 	 	 	 	 	 	 	 	 	 	 	 	 	10	10	10
Formaldehyde	Annual Avg	 	 	 	 	 	 	 	 	 	 	 	 	 	2.79	2.13	1.71
	Health Risk	 	 	 	 	 	 	 	 	 	 	 	 	 	21	16	13
Methylene Chloride	Annual Avg	 	 	 	 	 	 	 	 	 	 	 	 	 	0.19	0.16	0.13
	Health Risk	 	 	 	 	 	 	 	 	 	 	 	 	 	 <1	 <1	 <1
Perchloroethylene	Annual Avg	 	 	 	 	 	 	 	 	 	 	 	 	 	0.04	0.037	0.032
	Health Risk	 	 	 	 	 	 	 	 	 	 	 	 	 	2	1	1
Diesel PM	Annual Avg	No Monitoring Data Available															
	Health Risk																
Total Health Risk		 	 	 	 	 	 	 	 	 	 	 	 	 	179	143	105
																	
"1  Concentrations for Hexavalent Chromium are expressed as ng/m3, and concentrations for Diesel PM are expressed as ug/m3.  Concentrations for all other TACs are expressed as ppb."																	
2  Health Risk represents the number of excess cancer cases per million people based on a lifetime (70-year) exposure to the annual average concentration.  Total Health Risk represents only those compounds listed in																	
this table and only those with data for that year.  There may be other significant compounds for which monitoring and/or health risk information are not available.