Appendix C	Air Quality and Health Risk		Table C-20										

RIVERSIDE - Riverside - Rubidoux - Annual Average Concentrations and Health Risks													
TAC	Conc.*/ Risk**	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001
Acetaldehyde	Annual Avg	1.87	2.54	1.86	2.19	2.08	0.89	1.84			1.36	1.49	1.58
	Health Risk	9	12	9	11	10	4	9			7	7	8
Benzene	Annual Avg	2.55	2.22	1.9	1.77	2.01	1.45	1.03			0.87	0.85	0.69
	Health Risk	236	206	176	164	186	134	95			80	79	63
"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
	Health Risk	128	117	110	143	136	125	100			78	72	66
Carbon Tetrachloride	Annual Avg	0.131	0.136				0.102	0.079				0.096	0.086
	Health Risk	34	36				27	21				25	23
Chromium (Hexavalent)	Annual Avg			0.33	0.33	0.36	0.38	0.22			0.19	0.35	
	Health Risk			50	50	55	56	33			29	52	
para-Dichlorobenzene	Annual Avg		0.13	0.13	0.16	0.12	0.17	0.11				0.14	0.15
	Health Risk		9	8	10	8	11	7				9	10
Formaldehyde	Annual Avg	1.75	2.7	1.53	2.73	2.5	2.65	4.15			3.55	3.17	4.73
	Health Risk	13	20	11	20	18	19	31			26	23	35
Methylene Chloride	Annual Avg		0.69	0.6	1.1	0.93	0.98	0.83			0.58	0.69	0.44
	Health Risk		2	2	4	3	3	3			2	2	2
Perchloroethylene	Annual Avg	0.237	0.276	0.201	0.198	0.191	0.177	0.175				0.129	0.112
	Health Risk	9	11	8	8	8	7	7				5	4
Diesel PM	Annual Avg	No Monitoring Data Available											
	Health Risk												
Total Health Risk		429	413	374	410	424	386	306	0	0	222	274	211

*    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.