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

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2025		0.78	0.78	*	1.8	2.1	0.48	15	1.56
2024		0.8	0.8	1.47	3.1	5.3	1.09	30	0.66
2023		0.78	0.78	0.89	0.78	2.7	0.41	29	1.56
2022		0.78	0.78	1.18	2.2	3.9	0.82	31	1.56
2021		0.78	0.78	*	2.7	3.3	0.86	22	1.56
2020		0.78	*	*	*	3.0	1.03	8	1.56
2019		0.78	1.9	1.84	3.5	3.8	1.03	29	1.56
2018		0.78	2.0	2.14	3.7	4.8	1.29	34	1.56
2017		0.78	0.78	1.59	3.6	5.2	1.32	29	1.56
2016		0.78	1.7	*	3.1	5.9	1.20	28	1.56
2015		0.78	0.78	1.11	2.2	2.5	0.62	30	1.56
2014		1	1	2.24	4.5	5.4	1.55	30	2.0
2013		0.8	0.8	*	0.8	3.5	0.56	26	1.6
2012		1.5	1.5	1.72	1.5	5.0	0.72	28	3.0
2011		1.5	*	*	*	1.5	0.00	4	3.0
2010		1.5	1.5	1.50	1.5	1.5	0.00	28	3.0
2009		1.5	1.5	1.50	1.5	1.5	0.00	31	3.0
2008		*	*	*	*	*	*	0	*
2007		0.75	0.75	*	1.7	1.9	0.41	17	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		2.5	*	*	*	2.5	0.00	4	5.0
2002		2	2	4.29	7.4	16	3.35	29	4.0
2001		2	4.5	*	8.7	16	3.37	24	4.0
2000		2	2	*	2	6.0	1.12	15	4.0
1999		2	2	*	5.8	11	2.39	27	4.0
1998		2	2	2.53	4.2	8.0	1.38	29	4.0
1997		2	2	2.00	2	2	0.00	31	4.0
1996		2	2	2.00	2	2	0.00	29	4.0
1995		2	2	2.14	2	5.0	0.64	31	4.0
1994		2	2	*	4.4	8.0	1.58	27	4.0
1993		2	2	2.86	6.0	7.0	1.57	31	4.0
1992		2	*	*	*	9.0	2.54	10	4.0
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.