California Home	ARB:	Home	Search	Site Map				Contact Us

	Annual Toxics Summary Concord-2975 Treat Blvd 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	*	*
2004		*	*	*	*	*	*	0	*	*
2003		*	*	*	*	*	*	0	*	*
2002		*	*	*	*	*	*	0	*	*
2001		*	*	*	*	*	*	0	*	*
2000		0.025	*	*	*	0.13	0.047	5	0.05	*
1999		0.025	0.025	0.027	0.025	0.07	0.008	29	0.05	0.09
1998		0.025	0.025	0.032	0.025	0.15	0.029	31	0.05	0.1
1997		0.025	0.025	0.032	0.025	0.09	0.018	30	0.05	0.1
1996		0.025	0.025	0.026	0.025	0.06	0.007	24	0.05	0.09
1995		0.025	0.025	0.038	0.06	0.16	0.034	24	0.05	0.1
1994		0.025	0.025	*	0.07	0.15	0.036	14	0.05	*
1993		0.025	0.025	0.055	0.18	0.20	0.060	24	0.05	0.2
1992		0.025	0.025	0.050	0.13	0.15	0.044	24	0.05	0.2
1991		0.025	0.025	0.065	0.17	0.32	0.083	24	0.05	0.2
1990		0.025	*	*	*	1.4	0.470	8	0.05	*
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.