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

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2025		4.99	17	*	24	29	6.7	15	9.98
2024		5	20	22.3	33	54	11.7	28	2
2023		4.99	13	17.7	27	190	33.8	29	9.98
2022		4.99	19	19.1	28	38	8.8	31	9.98
2021		4.99	22	*	38	39	8.9	22	9.98
2020		11	*	*	*	49	12.6	8	9.98
2019		4.99	18	22.0	36	59	12.9	29	9.98
2018		4.99	18	*	34	55	13.7	28	9.98
2017		5	24	29.5	55	115	23.9	29	10
2016		10	23	*	45	61	14.3	28	10
2015		5	20	20.3	33	40	8.7	30	10
2014		4.2	16	17.5	34	49	12.2	30	8.4
2013		2.6	18	*	32	32	9.5	24	5.2
2012		4.5	22	*	33	40	8.4	24	9
2011		4.5	17	*	34	40	10.3	19	9
2010		4.5	19	*	45	57	15.7	16	9
2009		4.5	25	27.3	43	63	13.9	29	9
2008		*	*	*	*	*	*	0	*
2007		14	30	*	54	88	17.6	19	3
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		10	*	*	*	33	10.2	4	1
2002		5	30	33.3	48	140	25.4	29	1
2001		5	34	*	47	94	18.1	24	2
2000		9	29	*	36	43	8.9	15	2
1999		6	32	*	51	77	16.1	27	2
1998		7	22	24.5	38	82	14.3	29	2
1997		4	28	29.9	53	77	16.3	31	2
1996		8	27	29.3	45	57	12.0	29	2
1995		5	26	36.4	64	210	38.7	31	2
1994		5	24	*	48	240	42.8	27	2
1993		3	23	27.9	48	74	16.1	31	2
1992		6	27	*	56	82	18.4	22	2
1991		7	31	34.8	58	98	19.9	28	2
1990		5	32	*	50	61	15.8	16	2
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.