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	Annual Toxics Summary Simi Valley-Cochran Street FAQs Silicon 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	*
2012		*	*	*	*	*	*	0	*
2011		*	*	*	*	*	*	0	*
2010		*	*	*	*	*	*	0	*
2009		*	*	*	*	*	*	0	*
2008		*	*	*	*	*	*	0	*
2007		*	*	*	*	*	*	0	*
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		710	*	*	*	7100	2960	4	2
2002		1300	4200	4150	6700	9700	2170	29	2
2001		250	3300	*	6900	8100	2250	24	3
2000		200	2600	*	4600	5100	1490	15	3
1999		630	4400	*	6700	8500	2320	27	3
1998		110	2600	2470	4500	6200	1490	28	3
1997		450	2900	3260	5500	8700	1940	31	3
1996		74	4100	3390	5800	7200	2120	29	3
1995		190	3400	4090	8300	9200	2770	31	3
1994		470	3600	*	6600	8000	2190	27	3
1993		91	3300	3780	7600	9600	2650	31	3
1992		600	4100	*	7000	12000	2760	22	3
1991		320	4600	4990	8300	11000	2580	28	3
1990		1300	7600	*	14000	20000	5180	16	3
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.