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	Annual Toxics Summary Simi Valley-Cochran Street FAQs Selenium nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2024		1.65	1.65	*	1.65	3.6	0.53	13	3.3
2023		1.65	1.65	1.80	1.65	5.3	0.68	29	3.3
2022		1.65	1.65	1.65	1.65	1.65	0.00	31	3.3
2021		1.65	1.65	*	1.65	1.65	0.00	22	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	29	3.3
2018		1.65	1.65	2.51	1.65	12.1	2.97	34	3.3
2017		1.65	1.65	1.74	1.65	3.7	0.38	29	3.3
2016		1.65	1.65	*	1.65	1.65	0.00	28	3.3
2015		1.65	1.65	1.65	1.65	1.65	0.00	30	3.3
2014		1.35	1.35	1.48	1.35	4.1	0.62	30	2.7
2013		0.75	0.75	*	0.75	0.75	0.04	26	1.5
2012		0.75	0.75	0.83	0.75	1.8	0.25	28	1.5
2011		0.75	0.75	*	0.75	2.0	0.33	26	1.5
2010		0.75	0.75	0.75	0.75	0.75	0.00	28	1.5
2009		0.75	0.75	0.75	0.75	0.75	0.00	31	1.5
2008		*	*	*	*	*	*	0	*
2007		0.75	0.75	*	0.75	0.75	0.00	25	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		1	*	*	*	1	0.00	4	2.0
2002		1	1	1.00	1	1	0.00	29	2.0
2001		1	1	*	1	2.0	0.20	24	2.0
2000		1	1	*	1	1	0.00	15	2.0
1999		1	1	*	1	2.0	0.19	27	2.0
1998		1	1	1.00	1	1	0.00	29	2.0
1997		1	1	1.04	1	2.0	0.18	31	2.0
1996		1	1	1.06	1	3.0	0.37	29	2.0
1995		1	1	1.03	1	2.0	0.18	31	2.0
1994		1	1	*	2.4	4.0	0.79	27	2.0
1993		1	1	1.25	2.0	4.0	0.74	31	2.0
1992		1	1	*	3.0	6.0	1.26	22	2.0
1991		1	1	1.19	1	3.0	0.42	28	2.0
1990		1	1	*	1	2.0	0.34	16	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.