Appendix C	San Bernardino County: Upland-San Bernardino Road Air Quality and Health Risk										Table C-22			

Annual Average Concentrations and Health Risks														
TAC	Conc.*/Risk**	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001	2002
Acetaldehyde	Annual Avg	2.12	3.28	2.36	2.84	2.42	1.09	2.13						
	Health Risk	10	16	11	14	12	5	10						
Benzene	Annual Avg	2.73	2.70	2.14	1.92	2.15	1.62	1.11	1.11					
	Health Risk	253	250	198	178	199	150	103	103					
"1,3-Butadiene"	Annual Avg	0.35	0.34	0.31	0.39	0.34	0.31	0.26	0.25					
	Health Risk	131	128	116	147	126	117	97	95					
Carbon Tetrachloride	Annual Avg	0.13	0.14		0.10		0.10	0.08						
	Health Risk	35	36		27		26	20						
"Chromium, Hexavalent"	Annual Avg			0.22	0.16	0.16	0.20	0.12						
	Health Risk			33	24	24	30	17						
para-Dichlorobenzene	Annual Avg		0.13	0.14	0.14	0.10	0.13	0.10	0.14					
	Health Risk		9	9	9	7	9	7	9					
Formaldehyde	Annual Avg	2.35	3.34	1.98	3.25	2.67	3.21	5.20						
	Health Risk	17	25	15	24	20	24	38						
Methylene Chloride	Annual Avg	1.41	1.59	0.82	0.87	0.72	1.13	0.66	1.70					
	Health Risk	5	6	3	3	3	4	2	6					
Perchloroethylene	Annual Avg	0.42	0.72	0.36	0.40	0.29	0.26	0.20	0.21					
	Health Risk	17	29	15	16	11	11	8	8					
Diesel PM	Annual Avg	No Monitoring Data Available												
	Health Risk													
Total Health Risk		468	499	400	442	402	376	302	221					

"*    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.