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	Annual Toxics Summary Chico-Manzanita Avenue FAQs Dibenz(a,h)anthracene-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	*	*	*	0.37	0.133	5	0.05	*
2004		0.025	0.025	0.099	0.39	0.47	0.141	30	0.05	0.3
2003		0.025	0.025	0.082	0.22	0.58	0.134	31	0.05	0.3
2002		0.025	0.025	0.089	0.18	0.68	0.140	30	0.05	0.3
2001		0.025	0.025	0.091	0.33	0.82	0.168	31	0.05	0.3
2000		0.025	0.025	0.072	0.16	0.41	0.104	30	0.05	0.2
1999		0.025	0.025	0.063	0.19	0.50	0.103	30	0.05	0.2
1998		0.025	0.025	0.044	0.11	0.24	0.054	31	0.05	0.1
1997		0.025	0.025	0.064	0.10	0.43	0.092	30	0.05	0.2
1996		0.025	0.025	0.036	0.06	0.17	0.032	24	0.05	0.1
1995		0.025	0.025	0.043	0.09	0.18	0.042	24	0.05	0.1
1994		0.025	0.06	*	0.18	0.24	0.069	14	0.05	*
1993		0.025	0.025	0.081	0.19	0.32	0.085	24	0.05	0.3
1992		0.025	0.025	*	0.42	0.49	0.174	12	0.05	*
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.