Appendix C	Los Angeles County: Azusa Air Quality and Health Risk													Table C-19		

Annual Average Concentrations and Health Risks																
TAC	Conc.*/Risk**	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001	2002	2003	2004
Acetaldehyde	Annual Avg											1.1	1.31		1.25	1.53
	Health Risk											5	6		6	7
Benzene	Annual Avg											0.69		0.621	0.598	0.432
	Health Risk											64		57	55	40
"1,3-Butadiene"	Annual Avg											0.146		0.135	0.076	0.076
	Health Risk											55		51	29	29
Carbon Tetrachloride	Annual Avg											0.093		0.09	0.095	
	Health Risk											24		24	25	
"Chromium, Hexavalent"	Annual Avg											0.12			0.09	0.073
	Health Risk											19			14	11
para-Dichlorobenzene	Annual Avg											0.1		0.15	0.15	0.15
	Health Risk											7		10	10	10
Formaldehyde	Annual Avg											3.05	3.8		3.45	3.04
	Health Risk											22	28		25	22
Methylene Chloride	Annual Avg											1.32		1	0.96	1.43
	Health Risk											5		3	3	5
Perchloroethylene	Annual Avg											0.183		0.153	0.109	0.063
	Health Risk											7		6	4	3
Diesel PM	Annual Avg	No Monitoring Data Available														
	Health Risk															
Total Health Risk 												208	34	151	171	127

"*    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.