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	Annual Toxics Summary San Francisco-Arkansas Street FAQs Benzo(a)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		0.025	*	*	*	0.17	0.058	5	0.05	*
2004		0.025	0.025	0.053	0.11	0.26	0.051	30	0.05	0.2
2003		0.025	0.025	0.066	0.17	0.22	0.062	31	0.05	0.2
2002		0.025	0.025	0.045	0.08	0.22	0.050	30	0.05	0.1
2001		0.025	0.025	0.068	0.19	0.46	0.109	31	0.05	0.2
2000		0.025	0.025	0.089	0.22	0.62	0.137	30	0.05	0.3
1999		0.025	0.025	0.096	0.32	0.60	0.145	30	0.05	0.3
1998		0.025	0.025	0.120	0.40	0.50	0.153	31	0.05	0.4
1997		0.025	0.025	0.087	0.24	0.60	0.129	30	0.05	0.3
1996		0.025	0.025	0.091	0.15	0.59	0.139	24	0.05	0.3
1995		0.025	0.06	0.098	0.20	0.36	0.100	24	0.05	0.3
1994		0.025	0.10	*	0.31	0.51	0.143	14	0.05	*
1993		0.025	0.12	0.250	0.74	0.92	0.291	24	0.05	0.8
1992		0.025	0.06	0.172	0.61	0.71	0.235	24	0.05	0.5
1991		0.025	0.05	0.153	0.55	0.66	0.208	24	0.05	0.5
1990		0.025	0.07	0.282	0.92	1.8	0.466	24	0.05	0.9
1989		0.025	0.05	0.309	0.96	1.2	0.396	24	0.05	1

	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.