Appendix C	Los Angeles County: North Long Beach 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
Acetaldehyde	Annual Avg	2.49	2.52		2.36	2.18	0.81		1.43			1.16	1.11		1.06
	Health Risk	12	12		11	11	4		7			6	5		5
Benzene	Annual Avg	3.53	2.45	2.60	1.99	2.04	1.69		1.24	1.16	1.11	1.00		0.71	0.71
	Health Risk	327	227	241	185	188	157		115	108	103	92		65	65
"1,3-Butadiene"	Annual Avg	0.59	0.44	0.52	0.58	0.45	0.45		0.36	0.34	0.32	0.28		0.20	0.14
	Health Risk	223	165	197	216	168	169		137	127	121	104		75	53
Carbon Tetrachloride	Annual Avg	0.14	0.13				0.10			0.12		0.10		0.09	0.09
	Health Risk	37	34				26			31		26		24	24
"Chromium, Hexavalent"	Annual Avg			0.44	0.34	0.22	0.25		0.15	0.11	0.12	0.12		0.08	
	Health Risk			66	51	33	38		22	16	18	18		12	
para-Dichlorobenzene	Annual Avg		0.17	0.26	0.19	0.12	0.17		0.16			0.13		0.18	0.20
	Health Risk		11	17	13	8	11		10			8		12	13
Formaldehyde	Annual Avg	2.97	2.76		3.22	3.06	3.29		3.68			2.88	2.96		2.79
	Health Risk	22	20		24	23	24		27			21	22		21
Methylene Chloride	Annual Avg	2.05	0.88	1.00	1.15	0.84	0.98		0.74	0.60		0.65		0.27	0.31
	Health Risk	7	3	3	4	3	3		3	2		2		1	1
Perchloroethylene	Annual Avg	0.48	0.36	0.35	0.43	0.32	0.32		0.23	0.19		0.17		0.10	0.08
	Health Risk	19	14	14	17	13	13		9	8		7		4	3
Diesel PM	Annual Avg	No Monitoring Data Available													
	Health Risk														
Total Health Risk		647	486	538	521	447	445		330	292	242	284	27	193	185

"*    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.