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	Annual Toxics Summary Concord-2975 Treat Blvd FAQs Benzo(k)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	*	*	*	0.31	0.118	5	0.05	*
1999		0.025	0.025	0.073	0.19	0.40	0.095	29	0.05	0.02
1998		0.025	0.025	0.078	0.25	0.39	0.105	31	0.05	0.02
1997		0.025	0.025	0.085	0.22	0.46	0.116	30	0.05	0.03
1996		0.025	0.025	0.056	0.10	0.33	0.072	24	0.05	0.02
1995		0.025	0.025	0.114	0.39	0.74	0.185	24	0.05	0.04
1994		0.025	0.11	*	0.46	0.78	0.219	14	0.05	*
1993		0.025	0.025	0.218	0.87	1.1	0.357	24	0.05	0.07
1992		0.025	0.025	0.155	0.52	0.68	0.213	24	0.05	0.05
1991		0.025	0.025	0.137	0.47	0.68	0.196	24	0.05	0.04
1990		0.025	0.025	*	1.29	1.8	0.536	22	0.05	*
1989		0.025	0.025	*	0.70	0.92	0.291	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.