Appendix C	Kern County: Bakersfield - 5558 California Avenue Air Quality and Health Risk													Table C-36		

Annual Average Concentrations and Health Risks																
TAC	Conc.*/Risk**	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001	2002	2003	2004
Acetaldehyde	Annual Avg						0.49	1.59	1.22	1.27	1.69	1.19	1.27	1.37	1.51	
	Health Risk						2	8	6	6	8	6	6	7	7	
Benzene	Annual Avg						1.14	0.78	0.57	0.7	0.71	0.58	0.549	0.506	0.405	
	Health Risk						106	72	53	65	66	54	51	47	37	
"1,3-Butadiene"	Annual Avg						0.206	0.211	0.16	0.2	0.153	0.126	0.138	0.099	0.063	
	Health Risk						78	79	60	75	58	47	52	37	24	
Carbon Tetrachloride	Annual Avg						0.099	0.079				0.094	0.086	0.092	0.095	
	Health Risk						26	21				25	23	24	25	
"Chromium, Hexavalent"	Annual Avg						0.26	0.13	0.1	0.1	0.1	0.1		0.078	0.053	
	Health Risk						39	19	15	15	16	16		12	8	
para-Dichlorobenzene	Annual Avg						0.11	0.11	0.12			0.11	0.13	0.15	0.15	
	Health Risk						7	7	8			7	9	10	10	
Formaldehyde	Annual Avg						1.92	3.48	3.12	2.99	3.67	2.79	3.44	3.15	3.43	
	Health Risk						14	26	23	22	27	21	25	23	25	
Methylene Chloride	Annual Avg						0.54	0.64	0.5		0.5	0.58	0.26	0.1	0.11	
	Health Risk						2	2	2		2	2	<1	<1	<1	
Perchloroethylene	Annual Avg						0.092	0.119	0.039			0.065	0.058	0.047	0.037	
	Health Risk						4	5	2			3	2	2	1	
Diesel PM	Annual Avg	No Monitoring Data Available														
	Health Risk															
Total Health Risk 							278	239	169	183	177	181	168	162	137	

"*    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."																
**  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.