Appendix C	Riverside County: Riverside - Rubidoux Air Quality and Health Risk													Table C-20	

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	1.87	2.54	1.86	2.19	2.08	0.89	1.84			1.36	1.49	1.58	1.66	1.66
	Health Risk	9	12	9	11	10	4	9			7	7	8	8	8
Benzene	Annual Avg	2.55	2.22	1.90	1.77	2.01	1.45	1.03			0.87	0.85	0.69		0.62
	Health Risk	236	206	176	164	186	134	95			80	79	63		58
"1,3-Butadiene"	Annual Avg	0.34	0.31	0.29	0.38	0.36	0.33	0.27			0.21	0.19	0.18		0.12
	Health Risk	128	117	110	143	136	125	100			78	72	66		44
Carbon Tetrachloride	Annual Avg	0.13	0.14				0.10	0.08				0.10	0.09		0.09
	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	0.35
	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
	Health Risk		9	8	10	8	11	7				9	10		12
Formaldehyde	Annual Avg	1.75	2.70	1.53	2.73	2.50	2.65	4.15			3.55	3.17	4.73	4.36	4.18
	Health Risk	13	20	11	20	18	19	31			26	23	35	32	31
Methylene Chloride	Annual Avg		0.69	0.60	1.10	0.93	0.98	0.83			0.58	0.69	0.44		0.45
	Health Risk		2	2	4	3	3	3			2	2	2		2
Perchloroethylene	Annual Avg	0.24	0.28	0.20	0.20	0.19	0.18	0.18				0.13	0.11		0.06
	Health Risk	9	11	8	8	8	7	7				5	4		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

"*    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.