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	Annual Toxics Summary Fremont-Chapel Way FAQs Benzene parts per billion

Read About Estimated Risk

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit	Estimated Risk
2023		*	*	*	*	*	*	0	*	*
2022		*	*	*	*	*	*	0	*	*
2021		*	*	*	*	*	*	0	*	*
2020		*	*	*	*	*	*	0	*	*
2019		*	*	*	*	*	*	0	*	*
2018		*	*	*	*	*	*	0	*	*
2017		*	*	*	*	*	*	0	*	*
2016		*	*	*	*	*	*	0	*	*
2015		*	*	*	*	*	*	0	*	*
2014		*	*	*	*	*	*	0	*	*
2013		*	*	*	*	*	*	0	*	*
2012		*	*	*	*	*	*	0	*	*
2011		*	*	*	*	*	*	0	*	*
2010		0.06	0.2	*	0.28	0.44	0.102	17	0.05	*
2009		0.06	0.19	0.241	0.44	0.47	0.125	30	0.05	63
2008		0.1	0.2	0.23	0.4	0.59	0.129	31	0.05	60
2007		0.06	0.2	0.246	0.52	0.76	0.183	30	0.05	64
2006		0.09	0.21	0.295	0.62	1.1	0.244	29	0.05	77
2005		0.09	0.25	*	0.57	0.91	0.193	28	0.05	*
2004		0.06	0.23	0.286	0.55	1.0	0.215	30	0.05	74
2003		0.11	0.31	0.356	0.56	0.75	0.172	30	0.05	93
2002		0.13	0.32	0.418	0.72	0.91	0.23	28	0.05	109
2001		0.1	0.34	0.439	0.74	1.4	0.266	30	0.05	114
2000		0.1	0.4	0.53	1.4	1.9	0.51	30	0.2	138
1999		0.1	0.6	0.61	1.1	2.4	0.46	29	0.2	159
1998		0.1	0.8	0.76	1.3	4.0	0.70	33	0.2	198
1997		0.3	0.6	*	1.0	2.0	0.44	13	0.2	*
1996		0.25	0.25	0.58	1.4	2.1	0.54	31	0.5	152
1995		0.25	1.3	1.24	2.7	3.2	0.92	30	0.5	323
1994		0.25	1.3	1.25	2.6	3.7	0.91	31	0.5	326
1993		0.25	1.2	1.35	2.3	3.9	0.95	30	0.5	351
1992		0.25	1.2	1.21	2.0	3.7	0.78	30	0.5	315
1991		0.25	1.4	1.67	3.6	4.4	1.26	30	0.5	436
1990		0.25	2.0	1.92	3.7	4.7	1.30	30	0.5	499
1989		0.25	2.1	2.33	3.2	7.2	1.59	22	0.5	607

	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.