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	Annual Toxics Summary Concord-2975 Treat Blvd FAQs Indeno(1,2,3-cd)pyrene-10 nanograms per cubic meter

Read About Estimated Risk

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit	Estimated Risk
2005		*	*	*	*	*	*	0	*	*
2004		*	*	*	*	*	*	0	*	*
2003		*	*	*	*	*	*	0	*	*
2002		*	*	*	*	*	*	0	*	*
2001		*	*	*	*	*	*	0	*	*
2000		0.10	*	*	*	1.0	0.361	5	0.05	*
1999		0.025	0.07	0.238	0.81	1.5	0.364	29	0.05	0.08
1998		0.025	0.10	0.255	0.87	1.3	0.356	31	0.05	0.08
1997		0.025	0.025	0.240	0.73	1.4	0.363	30	0.05	0.08
1996		0.025	0.07	0.183	0.48	1.0	0.260	24	0.05	0.06
1995		0.025	0.17	0.384	1.1	2.0	0.529	24	0.05	0.1
1994		0.07	0.38	*	1.31	2.1	0.591	14	0.05	*
1993		0.025	0.12	0.570	2.22	2.7	0.858	24	0.05	0.2
1992		0.025	0.13	0.420	1.37	1.7	0.549	24	0.05	0.1
1991		0.025	0.10	0.541	1.57	3.0	0.754	24	0.05	0.2
1990		0.025	*	*	*	4.0	1.33	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.