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	Annual Toxics Summary San Jose-4th 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		*	*	*	*	*	*	0	*
2002		1900	*	*	*	4400	900	10	3
2001		700	3300	4060	6500	13000	2750	30	3
2000		490	3100	3540	5100	10000	1970	28	3
1999		1400	3200	3510	5000	12000	2050	30	3
1998		850	2200	2940	5700	10000	2140	29	3
1997		360	2700	2990	4800	7200	1560	30	3
1996		420	2700	2620	4800	5400	1460	28	3
1995		220	3100	3410	6500	11000	2720	30	3
1994		300	3200	3320	5700	8100	1810	31	3
1993		600	3900	3920	6500	11000	2220	29	3
1992		1100	3900	4210	6400	13000	2280	30	3
1991		1200	3700	5070	8600	15000	3210	28	3
1990		2100	5300	*	6900	15000	2850	15	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.