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

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2024		0.65	0.65	*	0.65	0.65	0.00	13	1.3
2023		0.65	0.65	0.68	0.65	1.4	0.13	29	1.3
2022		0.65	0.65	0.65	0.65	0.65	0.00	31	1.3
2021		0.65	0.65	*	0.65	0.65	0.00	22	1.3
2020		0.65	*	*	*	0.65	0.00	8	1.3
2019		0.65	0.65	0.68	0.65	1.3	0.13	29	1.3
2018		0.65	0.65	0.75	0.65	1.6	0.23	34	1.3
2017		0.65	0.65	1.02	2.2	2.9	0.67	29	1.3
2016		0.65	0.65	*	0.65	0.65	0.00	28	1.3
2015		0.65	0.65	0.65	0.65	0.65	0.00	30	1.3
2014		0.8	0.8	1.11	2.0	3.7	0.87	30	1.6
2013		0.75	0.75	*	0.75	0.75	0.04	26	1.5
2012		0.75	0.75	*	0.75	2.1	0.27	25	1.5
2011		0.75	0.75	0.75	0.75	0.75	0.00	30	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	26	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		7.5	*	*	*	7.5	0.00	4	15
2002		7.5	7.5	7.75	7.5	7.5	0.25	29	15
2001		8	8	*	8	8	0.00	24	16
2000		8	8	*	8	8	0.00	15	16
1999		8	8	*	8	8	0.00	27	16
1998		8	8	8.00	8	8	0.00	29	16
1997		8	8	8.00	8	8	0.00	31	16
1996		8	8	8.00	8	8	0.00	29	16
1995		8	8	8.00	8	8	0.00	31	16
1994		8	8	*	8	8	0.00	27	16
1993		8	8	8.00	8	8	0.00	31	16
1992		8	8	*	8	8	0.00	22	16
1991		8	8	8.00	8	8	0.00	28	16
1990		8	8	*	8	8	0.00	16	16
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.