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	Annual Toxics Summary Richmond-13th Street 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
2024		*	*	*	*	*	*	0	*	*
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	*	*
2009		*	*	*	*	*	*	0	*	*
2008		*	*	*	*	*	*	0	*	*
2007		*	*	*	*	*	*	0	*	*
2006		*	*	*	*	*	*	0	*	*
2005		*	*	*	*	*	*	0	*	*
2004		*	*	*	*	*	*	0	*	*
2003		*	*	*	*	*	*	0	*	*
2002		*	*	*	*	*	*	0	*	*
2001		*	*	*	*	*	*	0	*	*
2000		*	*	*	*	*	*	0	*	*
1999		*	*	*	*	*	*	0	*	*
1998		*	*	*	*	*	*	0	*	*
1997		0.1	*	*	*	2.0	0.62	9	0.2	*
1996		0.25	0.25	1.00	2.2	5.9	1.22	32	0.5	259
1995		0.25	1.3	1.44	2.2	2.8	0.60	30	0.5	375
1994		0.25	1.8	1.70	2.6	3.3	0.74	31	0.5	442
1993		0.25	1.6	1.76	2.6	3.4	0.64	30	0.5	457
1992		0.25	1.5	1.54	2.4	2.9	0.65	29	0.5	401
1991		0.25	1.4	1.92	3.8	4.3	1.13	29	0.5	498
1990		0.8	2.0	*	3.6	7.2	1.31	28	0.5	*
1989		1.0	1.9	*	4.6	5.4	1.30	23	0.5	*

	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.