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	Annual Toxics Summary Bakersfield-5558 California Avenue FAQs Selenium nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2023		1.65	1.65	*	1.65	4.2	0.57	21	3.3
2022		1.65	1.65	1.65	1.65	1.65	0.00	30	3.3
2021		1.65	1.65	*	1.65	1.65	0.00	24	3.3
2020		1.65	*	*	*	1.65	0.00	9	3.3
2019		1.65	1.65	1.71	1.65	3.7	0.35	34	3.3
2018		1.65	1.65	2.23	1.65	12.2	2.40	37	3.3
2017		1.65	1.65	1.86	1.65	4.5	0.65	33	3.3
2016		1.65	1.65	*	1.65	1.65	0.00	33	3.3
2015		1.65	1.65	1.65	1.65	1.65	0.00	33	3.3
2014		1.35	1.35	*	1.35	3.5	0.54	16	2.7
2013		0.75	0.75	*	1.8	2.1	0.45	21	1.5
2012		0.75	0.75	1.10	2.2	3.1	0.64	32	1.5
2011		0.75	0.75	*	0.75	3.8	0.70	28	1.5
2010		0.75	0.75	0.92	1.6	3.1	0.54	29	1.5
2009		0.75	0.75	0.79	0.75	1.8	0.19	29	1.5
2008		*	*	*	*	*	*	0	*
2007		0.75	0.75	0.75	0.75	0.75	0.00	29	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		1	*	*	*	1	0.00	5	2.0
2002		1	1	1.07	1	2.0	0.23	36	2.0
2001		1	1	1.06	1	3.0	0.32	39	2.0
2000		1	1	1.06	1	3.0	0.32	40	2.0
1999		1	1	1.02	1	2.0	0.16	39	2.0
1998		1	1	1.10	1	3.0	0.40	42	2.0
1997		1	1	1.11	1	3.0	0.52	34	2.0
1996		1	1	1.28	2.5	3.0	0.69	36	2.0
1995		1	1	1.00	1	1	0.00	30	2.0
1994		1	1	*	2.0	3.0	0.52	25	2.0
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.