Appendix C	Fresno County: Fresno-1st Street Air Quality and Health Risk										Table C-33			

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		2.29		1.89	1.40	0.67			1.50		1.43	1.60	1.55
	Health Risk		11		9	7	3			7		7	8	8
Benzene	Annual Avg		2.42	1.34	1.35	1.44	1.24	0.79	1.00	0.83	0.80	0.73	0.61	0.63
	Health Risk		224	124	125	133	115	73	92	76	74	68	56	58
"1,3-Butadiene"	Annual Avg		0.46	0.26	0.34	0.36	0.30	0.23	0.23	0.27	0.21	0.20	0.18	0.19
	Health Risk		173	99	129	134	113	88	87	100	80	73	68	73
Carbon Tetrachloride	Annual Avg		0.12		0.11		0.10	0.08				0.10	0.09	0.09
	Health Risk		32		28		26	21				25	23	23
"Chromium, Hexavalent"	Annual Avg			0.21	0.15	0.14	0.22	0.10	0.11	0.10	0.10	0.13		0.06
	Health Risk			31	22	21	33	16	16	15	15	20		9
para-Dichlorobenzene	Annual Avg			0.10	0.10	0.14	0.13	0.11	0.14			0.10	0.14	0.15
	Health Risk			7	7	9	8	7	9			7	9	10
Formaldehyde	Annual Avg		2.32		1.64	2.01	2.41			3.42		3.56	4.32	4.16
	Health Risk		17		12	15	18			25		26	32	31
Methylene Chloride	Annual Avg		0.62	0.54	0.69	0.59	0.58	0.50	0.52			0.50	0.27	0.24
	Health Risk		2	2	2	2	2	2	2			2	1	1
Perchloroethylene	Annual Avg		0.14	0.10	0.10	0.06	0.07	0.04	0.04			0.06	0.05	0.03
	Health Risk		6	4	4	2	3	2	2			2	2	1
Diesel PM	Annual Avg	No Monitoring Data Available												
	Health Risk													
Total Health Risk			465	267	338	323	321	209	208	223	169	230	199	214

"*    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.