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	Annual Toxics Summary El Cajon-Lexington Elementary School FAQs Selenium nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2025		1.65	1.65	*	1.65	1.65	0.00	16	3.3
2024		1.65	1.65	1.65	1.65	1.65	0.00	30	3.3
2023		1.65	1.65	1.65	1.65	1.65	0.00	30	3.3
2022		1.65	1.65	1.65	1.65	1.65	0.00	27	3.3
2021		1.65	1.65	*	1.65	4.9	0.67	23	3.3
2020		1.65	*	*	*	1.65	0.00	8	3.3
2019		1.65	1.65	1.65	1.65	1.65	0.00	28	3.3
2018		1.65	1.65	2.22	1.65	12.1	2.57	31	3.3
2017		1.65	1.65	1.72	1.65	3.4	0.32	30	3.3
2016		1.65	1.65	*	1.65	1.65	0.00	14	3.3
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	*
1996		*	*	*	*	*	*	0	*
1995		*	*	*	*	*	*	0	*
1994		*	*	*	*	*	*	0	*
1993		*	*	*	*	*	*	0	*
1992		*	*	*	*	*	*	0	*
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.