Appendix C	San Diego County: El Cajon - Redwood Ave Air Quality and Health Risk													Table C-40	

Annual Average Concentrations and Health Risks															
TAC	Conc.*/Risk**	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001	2002	2003
Acetaldehyde	Annual Avg	1.56	1.78	1.46	1.66			1.23			1.17	0.92	1.11	1.20	1.06
	Health Risk	8	9	7	8			6			6	4	5	6	5
Benzene	Annual Avg	2.50	2.20	1.94	1.51		1.14	0.86	0.89	0.91	0.98	0.74	0.59	0.56	0.56
	Health Risk	231	203	179	140		106	79	82	84	91	69	54	52	52
"1,3-Butadiene"	Annual Avg	0.39	0.33	0.33	0.40		0.28	0.25	0.24	0.24	0.24	0.18	0.16	0.13	0.10
	Health Risk	145	125	125	150		105	95	88	90	90	68	61	50	38
Carbon Tetrachloride	Annual Avg	0.13	0.13				0.10	0.08				0.10	0.09	0.09	0.09
	Health Risk	35	33				27	21				25	23	24	24
"Chromium, Hexavalent"	Annual Avg			0.24	0.18			0.10	0.11		0.10	0.10		0.04	0.04
	Health Risk			36	26			16	17		15	15		6	6
para-Dichlorobenzene	Annual Avg			0.12	0.13		0.12	0.11	0.13				0.15	0.15	0.15
	Health Risk			8	8		8	7	8				10	10	10
Formaldehyde	Annual Avg	2.01	1.76	1.42	2.06			3.14			2.84	2.32	2.63	3.41	3.05
	Health Risk	15	13	10	15			23			21	17	19	25	22
Methylene Chloride	Annual Avg	0.59	1.07	1.87	1.25		0.70	0.61	0.52		0.52	0.87	0.19	0.18	0.18
	Health Risk	2	4	7	4		2	2	2		2	3	1	1	1
Perchloroethylene	Annual Avg	0.33	0.31	0.32	0.26		0.35	0.17	0.15			0.10	0.07	0.07	0.06
	Health Risk	13	12	13	10		14	7	6			4	3	3	2
Diesel PM	Annual Avg	No Monitoring Data Available													
	Health Risk														
Total Health Risk		449	399	385	361		262	256	203	174	225	205	176	177	160

"*    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.