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	Annual Toxics Summary Concord-2975 Treat Blvd FAQs Benzo(g,h,i)perylene-10 nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		*	*	*	*	*	*	0	*
2002		*	*	*	*	*	*	0	*
2001		*	*	*	*	*	*	0	*
2000		0.17	*	*	*	1.5	0.520	5	0.05
1999		0.025	0.17	0.374	1.16	2.0	0.508	29	0.05
1998		0.025	0.19	0.420	1.2	2.3	0.571	31	0.05
1997		0.025	0.11	0.413	1.04	2.3	0.588	30	0.05
1996		0.025	0.12	0.308	0.82	1.7	0.435	24	0.05
1995		0.025	0.33	0.625	1.86	2.8	0.741	24	0.05
1994		0.13	0.67	*	2.34	3.0	0.912	14	0.05
1993		0.07	0.22	0.813	2.85	3.2	1.07	24	0.05
1992		0.025	0.26	0.696	2.34	2.4	0.862	24	0.05
1991		0.025	0.16	0.820	2.61	3.3	1.07	24	0.05
1990		0.07	*	*	*	5.8	1.86	8	0.05
1989		*	*	*	*	*	*	0	*

	Notes:	Values below the Limit of Detection (LoD) assumed to be ½ LoD. Means and risks shown only for years with data in all 12 months. "*" means there was insufficient or no data available to determine the value.