Appendix C	San Diego Air Quality and Health Risk										Table C-41						

Annual Average Concentrations and Health Risks																	
TAC	Conc.1/Risk2	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001	2002	2003	2004	2005
Acetaldehyde	Annual Avg	1.33	1.5	1.22	1.41	1.48	0.64	1.03	1	0.86	1.04	0.84	0.95	0.97	0.89	0.89	1.01
	Health Risk	6	7	6	7	7	3	5	5	4	5	4	5	5	4	4	5
Benzene	Annual Avg	2.25	1.7	1.48	1.16	1.39	0.98	0.76	0.76	0.76	0.86	0.65	0.505	0.491	0.483	0.371	0.404
	Health Risk	208	158	137	107	129	90	71	70	70	79	60	47	45	45	34	37
"1,3-Butadiene"	Annual Avg	0.333	0.257	0.258	0.312	0.307	0.242	0.208	0.198	0.196	0.22	0.159	0.136	0.12	0.089	0.074	0.073
	Health Risk	125	97	97	117	115	91	78	75	74	83	60	51	45	33	28	27
Carbon Tetrachloride	Annual Avg	0.132	0.127	 	0.103	 	0.099	0.077	 	 	 	0.094	0.086	0.092	0.093	 	
	Health Risk	35	34	 	27	 	26	20	 	 	 	25	23	24	25	 	
"Chromium, Hexavalent"	Annual Avg	 	 	0.24	0.19	0.16	0.18	0.11	0.11	0.1	0.1	0.1	 	0.045	0.05	0.03	0.043
	Health Risk	 	 	36	28	23	27	16	16	15	15	15	 	7	8	5	6
para-Dichlorobenzene	Annual Avg	 	0.1	0.11	0.13	0.15	0.12	0.11	0.13	 	 	 	0.15	0.15	0.15	0.15	0.15
	Health Risk	 	7	8	8	10	8	7	8	 	 	 	10	10	10	10	10
Formaldehyde	Annual Avg	1.64	1.53	1.26	1.76	2.25	2.13	2.62	2.62	2.27	2.67	2.23	2.59	2.99	2.68	2.19	2.42
	Health Risk	12	11	9	13	17	16	19	19	17	20	16	19	22	20	16	18
Methylene Chloride	Annual Avg	0.59	0.83	1.34	1.13	0.73	0.63	0.59	0.57	 	0.53	0.76	0.17	0.16	0.16	0.13	0.14
	Health Risk	2	3	5	4	3	2	2	2	 	2	3	 <1	 <1	 <1	 <1	 <1
Perchloroethylene	Annual Avg	0.282	0.269	0.263	0.2	0.207	0.249	0.147	0.125	 	 	0.089	0.061	0.06	0.047	0.037	0.041
	Health Risk	11	11	11	8	8	10	6	5	 	 	4	2	2	2	1	2
Diesel PM3	Annual Avg	(2.9)					(1.9)					(1.4)					
	Health Risk	(870)					(570)					(420)					
Average Basin Risk	w/o Diesel PM	399	328	309	319	312	273	224	200	180	204	187	157	160	147	98	105
	w/ Diesel PM	(1269)					(843)					(607)					
"1  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."																	
2  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.																	
"3  The Diesel PM concentrations are estimates based on receptor modeling, and they are available for selected years. Currently, the Diesel PM estimates are being reviewed."