2002 Almanac (page 459)  Table C-19  San Diego Air Basin:  Annual Average Concentrations and Health Risks by Site																							

		Annual Average Concentration*											Health Risk**										
COUNTY / SITE	TAC	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000
SAN DIEGO Chula Vista	Acetaldehyde	1.10	1.21	0.99	1.16	1.32	0.64	0.83	0.91	0.70	0.91	0.75	5	6	5	6	6	3	4	4	3	4	4
	Benzene	2.00	1.21	1.03	0.80	1.08	0.81		0.63	0.61		0.55	186	112	95	74	100	75		58	56		51
	"1,3-Butadiene"	0.28	0.18	0.18	0.23	0.26	0.21		0.16	0.15		0.14	105	69	69	85	98	77		61	57		51
	Carbon Tetrachloride	0.13	0.13		0.10		0.10					0.09	35	34		27		26					25
	Chromium (Hexavalent)			0.24	0.20	0.17	0.20	0.11	0.10	0.10	0.11	0.10			37	30	25	29	16	15	15	16	16
	para-Dichlorobenzene		0.10	0.11	0.13	0.12	0.11		0.13					7	7	8	8	7		8			
	Formaldehyde	1.26	1.30	1.10	1.46	2.08	1.81	2.10	2.37	2.00	2.49	2.14	9	10	8	11	15	13	15	17	15	18	16
	Methylene Chloride	0.58	0.59	0.81	1.01	0.57	0.57		0.62			0.65	2	2	3	3	2	2		2			2
	Perchloroethylene	0.24	0.23	0.21	0.14	0.13	0.15		0.10			0.08	9	9	8	6	5	6		4			3
	Diesel PM	No Monitoring Data Available																					
Total Health Risk													351	249	232	250	259	238	35	169	146	38	168

SAN DIEGO El Cajon-Redwood Avenue	Acetaldehyde	1.56	1.78	1.46	1.66			1.23			1.17	0.92	8	9	7	8			6			6	4
	Benzene	2.50	2.20	1.94	1.51		1.14	0.86	0.89	0.91	0.98	0.74	231	203	179	140		106	79	82	84	91	69
	"1,3-Butadiene"	0.39	0.33	0.33	0.40		0.28	0.25	0.24	0.24	0.24	0.18	145	125	125	150		105	95	88	90	90	68
	Carbon Tetrachloride	0.13	0.13				0.10	0.08				0.10	35	33				27	21				25
	Chromium (Hexavalent)			0.24	0.18			0.10	0.11		0.10	0.10			36	26			16	17		15	15
	para-Dichlorobenzene			0.12	0.13		0.12	0.11	0.13						8	8		8	7	8			
	Formaldehyde	2.01	1.76	1.42	2.06			3.14			2.84	2.32	15	13	10	15			23			21	17
	Methylene Chloride	0.59	1.07	1.87	1.25		0.70	0.61	0.52		0.52	0.87	2	4	7	4		2	2	2		2	3
	Perchloroethylene	0.33	0.31	0.32	0.26		0.35	0.17	0.15			0.10	13	12	13	10		14	7	6			4
	Diesel PM	No Monitoring Data Available																					
Total Health Risk													449	399	385	361		262	256	203	174	225	205

BASIN SUMMARY	Acetaldehyde	1.33	1.50	1.22	1.41	1.48	0.64	1.03	1.00	0.86	1.04	0.84	6	7	6	7	7	3	5	5	4	5	4
	Benzene	2.25	1.70	1.48	1.16	1.39	0.98	0.76	0.76	0.76	0.86	0.65	208	158	137	107	129	90	71	70	70	79	60
	"1,3-Butadiene"	0.33	0.26	0.26	0.31	0.31	0.24	0.21	0.20	0.20	0.22	0.16	125	97	97	117	115	91	78	75	74	83	60
	Carbon Tetrachloride	0.13	0.13		0.10		0.10	0.08				0.09	35	34		27		26	20				25
	Chromium (Hexavalent)			0.24	0.19	0.16	0.18	0.11	0.11	0.10	0.10	0.10			36	28	23	27	16	16	15	15	15
	para-Dichlorobenzene		0.10	0.11	0.13	0.15	0.12	0.11	0.13					7	8	8	10	8	7	8			
	Formaldehyde	1.64	1.53	1.26	1.76	2.25	2.13	2.62	2.62	2.27	2.67	2.23	12	11	9	13	17	16	19	19	17	20	16
	Methylene Chloride	0.59	0.83	1.34	1.13	0.73	0.63	0.59	0.57		0.53	0.76	2	3	5	4	3	2	2	2		2	3
	Perchloroethylene	0.28	0.27	0.26	0.20	0.21	0.25	0.15	0.13			0.09	11	11	11	8	8	10	6	5			4
	Diesel PM***	2.9					1.9					1.4	870					570					420
Average Basin Health Risk													399	328	309	319	312	273	224	200	180	204	187

*     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.																							
"***  The Diesel PM concentrations are estimates based on receptor modeling. Because data are not available for all years, Diesel PM is not included in the Average Basin Health Risk number. "