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	Annual Toxics Summary El Cajon-Redwood Avenue FAQs Zirconium nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2023		*	*	*	*	*	*	0	*
2022		*	*	*	*	*	*	0	*
2021		*	*	*	*	*	*	0	*
2020		*	*	*	*	*	*	0	*
2019		*	*	*	*	*	*	0	*
2018		*	*	*	*	*	*	0	*
2017		*	*	*	*	*	*	0	*
2016		*	*	*	*	*	*	0	*
2015		*	*	*	*	*	*	0	*
2014		2.7	*	*	*	4.4	0.77	4	1.5
2013		0.75	0.75	*	2.2	3.1	0.67	28	1.5
2012		0.75	0.75	0.96	1.7	4.4	0.74	29	1.5
2011		0.75	0.75	0.75	0.75	0.75	0.00	31	1.5
2010		0.75	0.75	*	0.75	2.0	0.29	24	1.5
2009		0.75	0.75	0.81	0.75	1.8	0.25	31	1.5
2008		*	*	*	*	*	*	0	*
2007		0.75	0.75	0.93	1.7	3.3	0.62	29	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		1	*	*	*	9.0	3.13	5	2.0
2002		1	4.0	4.14	6.2	7.0	1.78	29	2.0
2001		1	4.0	3.67	6.0	8.0	1.87	30	2.0
2000		1	4.0	*	6.0	8.0	1.98	14	2.0
1999		1	3.0	*	5.2	10	2.40	20	2.0
1998		1	2.0	2.65	4.7	7.0	1.74	24	2.0
1997		1	1	2.21	4.0	5.0	1.36	27	2.0
1996		1	2.0	2.71	6.0	7.0	1.98	27	2.0
1995		1	3.0	*	5.4	10	2.10	27	2.0
1994		1	2.0	*	4.0	6.0	1.27	27	2.0
1993		1	3.0	2.97	5.0	7.0	1.80	29	2.0
1992		1	2.0	2.51	4.5	10	2.06	26	2.0
1991		1	4.0	4.39	5.0	27	4.54	31	2.0
1990		1	5.0	*	7.6	9.0	2.32	15	2.0
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.