Appendix C	San Bernardino County: Fontana-Arrow Highway Air Quality and Health Risk										Table C-21			

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													
	Health Risk													
Benzene	Annual Avg									0.98				
	Health Risk									91				
"1,3-Butadiene"	Annual Avg									0.24				
	Health Risk									92				
Carbon Tetrachloride	Annual Avg									0.11				
	Health Risk									30				
"Chromium, Hexavalent"	Annual Avg													
	Health Risk													
para-Dichlorobenzene	Annual Avg													
	Health Risk													
Formaldehyde	Annual Avg													
	Health Risk													
Methylene Chloride	Annual Avg									0.59				
	Health Risk									2				
Perchloroethylene	Annual Avg									0.18				
	Health Risk									7				
Diesel PM	Annual Avg	No Monitoring Data Available												
	Health Risk													
Total Health Risk										222				

"*    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.