Appendix C	Air Quality and Health Risk		Table C-39										

SAN DIEGO - El Cajon - Redwood Avenue - Annual Average Concentrations and Health Risks													
TAC	Conc.*/ Risk**	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001
Acetaldehyde	Annual Avg	1.56	1.78	1.46	1.66			1.23			1.17	0.92	1.11
	Health Risk	8	9	7	8			6			6	4	5
Benzene	Annual Avg	2.5	2.2	1.94	1.51		1.14	0.86	0.89	0.91	0.98	0.74	0.59
	Health Risk	231	203	179	140		106	79	82	84	91	69	54
"1,3-Butadiene"	Annual Avg	0.387	0.332	0.331	0.398		0.279	0.252	0.235	0.24	0.24	0.182	0.162
	Health Risk	145	125	125	150		105	95	88	90	90	68	61
Carbon Tetrachloride	Annual Avg	0.131	0.125				0.1	0.078				0.095	0.086
	Health Risk	35	33				27	21				25	23
Chromium (Hexavalent)	Annual Avg			0.24	0.18			0.1	0.11		0.1	0.1	
	Health Risk			36	26			16	17		15	15	
para-Dichlorobenzene	Annual Avg			0.12	0.13		0.12	0.11	0.13				0.15
	Health Risk			8	8		8	7	8				10
Formaldehyde	Annual Avg	2.01	1.76	1.42	2.06			3.14			2.84	2.32	2.63
	Health Risk	15	13	10	15			23			21	17	19
Methylene Chloride	Annual Avg	0.59	1.07	1.87	1.25		0.7	0.61	0.52		0.52	0.87	0.19
	Health Risk	2	4	7	4		2	2	2		2	3	0.7
Perchloroethylene	Annual Avg	0.329	0.308	0.319	0.256		0.352	0.168	0.147			0.1	0.065
	Health Risk	13	12	13	10		14	7	6			4	3
Diesel PM	Annual Avg	No Monitoring Data Available											
	Health Risk												
Total Health Risk		449	399	385	361	0	262	256	203	174	225	205	175.7

*    Concentrations for Chromium (Hexavalent) are expressed as ng/m3 and concentrations for Diesel PM are expressed as ug/m3.  Concentrations for all other TACs are expressed as parts per billion.													
**   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.