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	Annual Toxics Summary Fontana-Arrow Highway 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	*	*
2004		*	*	*	*	*	*	0	*	*
2003		0.025	0.025	0.055	0.15	0.20	0.056	29	0.05	0.2
2002		0.025	0.025	0.054	0.09	0.27	0.051	31	0.05	0.2
2001		0.025	0.025	0.052	0.12	0.26	0.060	29	0.05	0.2
2000		0.025	0.025	0.064	0.17	0.33	0.076	31	0.05	0.2
1999		0.025	0.06	0.071	0.15	0.27	0.059	30	0.05	0.2
1998		0.025	0.025	*	0.13	0.23	0.053	23	0.05	*
1997		*	*	*	*	*	*	0	*	*
1996		*	*	*	*	*	*	0	*	*
1995		*	*	*	*	*	*	0	*	*
1994		*	*	*	*	*	*	0	*	*
1993		*	*	*	*	*	*	0	*	*
1992		*	*	*	*	*	*	0	*	*
1991		*	*	*	*	*	*	0	*	*
1990		*	*	*	*	*	*	0	*	*
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.