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	Annual Toxics Summary San Francisco-Arkansas Street 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		0.025	*	*	*	0.09	0.029	5	0.05	*
2004		0.025	0.025	0.033	0.06	0.11	0.019	30	0.05	0.01
2003		0.025	0.025	0.039	0.09	0.10	0.025	31	0.05	0.01
2002		0.025	0.025	0.032	0.05	0.11	0.023	30	0.05	0.01
2001		0.025	0.025	0.041	0.10	0.21	0.046	31	0.05	0.01
2000		0.025	0.025	0.050	0.12	0.26	0.056	30	0.05	0.02
1999		0.025	0.025	0.061	0.17	0.41	0.087	30	0.05	0.02
1998		0.025	0.025	0.056	0.15	0.20	0.058	31	0.05	0.02
1997		0.025	0.025	0.046	0.10	0.20	0.046	30	0.05	0.01
1996		0.025	0.025	0.046	0.07	0.22	0.051	24	0.05	0.01
1995		0.025	0.025	0.053	0.09	0.16	0.039	24	0.05	0.02
1994		0.025	0.07	*	0.16	0.22	0.061	14	0.05	*
1993		0.025	0.07	0.126	0.32	0.40	0.124	24	0.05	0.04
1992		0.025	0.025	0.093	0.23	0.38	0.101	24	0.05	0.03
1991		0.025	0.025	0.083	0.24	0.30	0.092	24	0.05	0.03
1990		0.025	0.025	0.164	0.51	0.82	0.232	24	0.05	0.05
1989		0.025	0.025	*	0.40	0.47	0.150	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.