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	Annual Toxics Summary Concord-2975 Treat Blvd 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
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	*	*
2009		*	*	*	*	*	*	0	*	*
2008		*	*	*	*	*	*	0	*	*
2007		*	*	*	*	*	*	0	*	*
2006		*	*	*	*	*	*	0	*	*
2005		*	*	*	*	*	*	0	*	*
2004		*	*	*	*	*	*	0	*	*
2003		*	*	*	*	*	*	0	*	*
2002		*	*	*	*	*	*	0	*	*
2001		*	*	*	*	*	*	0	*	*
2000		0.3	*	*	*	1.4	0.43	5	0.2	*
1999		0.1	0.5	0.57	1.3	1.7	0.41	30	0.2	149
1998		0.1	0.5	0.57	1.4	1.7	0.50	31	0.2	149
1997		0.1	0.5	0.56	1.2	1.9	0.47	30	0.2	146
1996		0.25	0.25	0.48	1.4	1.8	0.47	32	0.5	124
1995		0.25	1.3	1.09	2.0	3.6	0.84	30	0.5	284
1994		0.25	0.9	1.08	2.0	3.6	0.82	32	0.5	280
1993		0.25	0.9	1.13	2.8	3.1	1.03	30	0.5	295
1992		0.25	1.2	1.41	2.8	4.8	1.11	31	0.5	366
1991		0.25	1.0	1.58	3.5	4.9	1.36	29	0.5	412
1990		0.25	1.5	1.84	3.6	4.3	1.26	28	0.5	479
1989		0.25	1.8	2.14	4.1	4.8	1.46	23	0.5	558

	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.