Appendix C	Riverside County: Riverside - Rubidoux Air Quality and Health Risk													Table C-23			

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	1.87	2.54	1.86	2.19	2.08	0.89	1.84	 	 	1.36	1.49	1.58	1.66	1.66	1.59	1.7
	Health Risk	9	12	9	11	10	4	9	 	 	7	7	8	8	8	8	8
Benzene	Annual Avg	2.55	2.22	1.9	1.77	2.01	1.45	1.03	 	 	0.87	0.85	0.685	 	0.623	0.526	0.505
	Health Risk	236	206	176	164	186	134	95	 	 	80	79	63	 	58	49	47
"1,3-Butadiene"	Annual Avg	0.34	0.312	0.292	0.379	0.363	0.332	0.267	 	 	0.208	0.193	0.175	 	0.118	0.121	0.112
	Health Risk	128	117	110	143	136	125	100	 	 	78	72	66	 	44	45	42
Carbon Tetrachloride	Annual Avg	0.131	0.136	 	 	 	0.102	0.079	 	 	 	0.096	0.086	 	0.093	 	
	Health Risk	34	36	 	 	 	27	21	 	 	 	25	23	 	24	 	
"Chromium, Hexavalent"	Annual Avg	 	 	0.33	0.33	0.36	0.38	0.22	 	 	0.19	0.35	 	0.41	0.348	 	 
	Health Risk	 	 	50	50	55	56	33	 	 	29	52	 	62	52	 	 
para-Dichlorobenzene	Annual Avg	 	0.13	0.13	0.16	0.12	0.17	0.11	 	 	 	0.14	0.15	 	0.17	0.16	0.15
	Health Risk	 	9	8	10	8	11	7	 	 	 	9	10	 	12	11	10
Formaldehyde	Annual Avg	1.75	2.7	1.53	2.73	2.5	2.65	4.15	 	 	3.55	3.17	4.73	4.36	4.18	3.46	3.47
	Health Risk	13	20	11	20	18	19	31	 	 	26	23	35	32	31	25	26
Methylene Chloride	Annual Avg	 	0.69	0.6	1.1	0.93	0.98	0.83	 	 	0.58	0.69	0.44	 	0.45	0.29	0.3
	Health Risk	 	2	2	4	3	3	3	 	 	2	2	2	 	2	1	1
Perchloroethylene	Annual Avg	0.237	0.276	0.201	0.198	0.191	0.177	0.175	 	 	 	0.129	0.112	 	0.06	0.051	0.046
	Health Risk	9	11	8	8	8	7	7	 	 	 	5	4	 	2	2	2
Diesel PM	Annual Avg	No Monitoring Data Available															
	Health Risk																
Total Health Risk		429	413	374	410	424	386	306	 	 	222	274	211	102	233	141	136
																	
"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.