Appendix C	Kern County: Bakersfield-5558 California Ave Air Quality and Health Risk										Table C-32			

Annual Average Concentrations and Health Risks														
TAC	Conc.*/Risk**	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001	2002
Acetaldehyde	Annual Avg						0.49	1.59	1.22	1.27	1.69	1.19	1.27	1.37
	Health Risk						2	8	6	6	8	6	6	7
Benzene	Annual Avg						1.14	0.78	0.57	0.70	0.71	0.58	0.55	0.51
	Health Risk						106	72	53	65	66	54	51	47
"1,3-Butadiene"	Annual Avg						0.21	0.21	0.16	0.20	0.15	0.13	0.14	0.10
	Health Risk						78	79	60	75	58	47	52	37
Carbon Tetrachloride	Annual Avg						0.10	0.08				0.09	0.09	0.09
	Health Risk						26	21				25	23	24
"Chromium, Hexavalent"	Annual Avg						0.26	0.13	0.10	0.10	0.10	0.10		0.08
	Health Risk						39	19	15	15	16	16		12
para-Dichlorobenzene	Annual Avg						0.11	0.11	0.12			0.11	0.13	0.15
	Health Risk						7	7	8			7	9	10
Formaldehyde	Annual Avg						1.92	3.48	3.12	2.99	3.67	2.79	3.44	3.15	
	Health Risk						14	26	23	22	27	21	25	23	
Methylene Chloride	Annual Avg						0.54	0.64	0.50		0.50	0.58	0.26	0.10	
	Health Risk						2	2	2		2	2	1	0	
Perchloroethylene	Annual Avg						0.09	0.12	0.04			0.07	0.06	0.05	
	Health Risk						4	5	2			3	2	2	
Diesel PM	Annual Avg	No Monitoring Data Available													
	Health Risk														
Total Health Risk							278	239	169	183	177	181	169	162	

"*    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.