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

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2024		0.7	0.7	*	2.1	3.0	0.78	13	0.0
2023		0.65	1.7	1.88	3.6	4.4	1.12	30	1.3
2022		0.65	1.8	1.92	3.9	5.3	1.27	27	1.3
2021		0.65	1.4	*	3.7	6.5	1.50	23	1.3
2020		0.65	*	*	*	4.4	1.49	8	1.3
2019		0.65	1.9	2.47	4.4	6.7	1.64	28	1.3
2018		0.65	1.8	1.81	4.1	4.6	1.33	31	1.3
2017		0.65	1.6	1.94	4.5	6.2	1.64	30	1.3
2016		0.65	2.0	*	4.8	5.2	1.58	14	1.3
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.