Appendix C	Kern County: Bakersfield-Chester Avenue Air Quality and Health Risk										Table C-31			

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	1.87	1.83	1.60	2.00									
	Health Risk	9	9	8	10									
Benzene	Annual Avg	2.68	2.22	1.54	1.47									
	Health Risk	248	205	143	136									
"1,3-Butadiene"	Annual Avg	0.39	0.31	0.24	0.33									
	Health Risk	146	115	90	123									
Carbon Tetrachloride	Annual Avg	0.13	0.13		0.10									
	Health Risk	33	33		27									
"Chromium, Hexavalent"	Annual Avg			0.21	0.21									
	Health Risk			31	31									
para-Dichlorobenzene	Annual Avg			0.12	0.17									
	Health Risk			8	11									
Formaldehyde	Annual Avg	2.44	1.62	1.36	1.85									
	Health Risk	18	12	10	14									
Methylene Chloride	Annual Avg	0.92	0.65	0.52	0.99									
	Health Risk	3	2	2	3									
Perchloroethylene	Annual Avg	0.09	0.13	0.08	1.48									
	Health Risk	3	5	3	59									
Diesel PM	Annual Avg	No Monitoring Data Available												
	Health Risk													
Total Health Risk		460	381	295	414									

"*    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.