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	Annual Toxics Summary Concord-2975 Treat Blvd FAQs Benzo(b)fluoranthene-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		0.025	*	*	*	0.78	0.299	5	0.05	*
1999		0.025	0.05	0.170	0.48	1.1	0.260	29	0.05	0.05
1998		0.025	0.08	0.180	0.58	1.0	0.272	31	0.05	0.06
1997		0.025	0.025	0.189	0.53	1.1	0.293	30	0.05	0.06
1996		0.025	0.025	0.118	0.26	0.82	0.190	24	0.05	0.04
1995		0.025	0.08	0.274	0.96	1.8	0.450	24	0.05	0.09
1994		0.05	0.27	*	1.07	1.8	0.509	14	0.05	*
1993		0.025	0.07	0.498	2.1	2.6	0.842	24	0.05	0.2
1992		0.025	0.10	0.359	1.2	1.5	0.494	24	0.05	0.1
1991		0.025	0.08	0.382	1.41	1.8	0.574	24	0.05	0.1
1990		0.025	0.08	*	3.95	5.4	1.66	22	0.05	*
1989		0.025	0.08	*	2.24	3.0	0.982	18	0.05	*

	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.