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	Annual Toxics Summary North Long Beach FAQs Selenium nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2025		*	*	*	*	*	*	0	*
2024		*	*	*	*	*	*	0	*
2023		*	*	*	*	*	*	0	*
2022		*	*	*	*	*	*	0	*
2021		*	*	*	*	*	*	0	*
2020		*	*	*	*	*	*	0	*
2019		*	*	*	*	*	*	0	*
2018		*	*	*	*	*	*	0	*
2017		*	*	*	*	*	*	0	*
2016		*	*	*	*	*	*	0	*
2015		*	*	*	*	*	*	0	*
2014		*	*	*	*	*	*	0	*
2013		0.75	0.75	*	0.75	0.75	0.04	20	1.5
2012		0.75	0.75	1.20	1.8	7.4	1.29	29	1.5
2011		0.75	0.75	*	2.5	3.4	0.77	26	1.5
2010		0.75	0.75	0.85	0.75	2.1	0.32	25	1.5
2009		0.75	0.75	0.75	0.75	0.75	0.00	29	1.5
2008		*	*	*	*	*	*	0	*
2007		0.75	0.75	*	0.75	21	4.13	24	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		1	*	*	*	1	0.00	4	2.0
2002		1	1	*	1	3.0	0.38	27	2.0
2001		1	1	1.11	1	3.0	0.45	28	2.0
2000		1	1	*	1	4.0	0.58	29	2.0
1999		1	1	1.40	1	7.0	1.30	26	2.0
1998		1	1	1.26	2.0	3.0	0.58	29	2.0
1997		1	1	1.65	3.0	7.0	1.30	30	2.0
1996		1	1	*	3.0	4.0	0.95	23	2.0
1995		1	1	1.11	1	3.0	0.41	29	2.0
1994		1	1	2.57	4.0	18	3.23	29	2.0
1993		1	1	1.93	4.1	8.0	1.71	30	2.0
1992		1	1	2.14	3.3	12	2.76	30	2.0
1991		1	1	1.38	2.3	4.0	0.77	28	2.0
1990		1	1	*	1	4.0	0.75	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.