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	Annual Toxics Summary Fremont-Chapel Way 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		960	*	*	*	2700	720	5	2
2002		470	2300	*	4000	5100	1270	24	2
2001		660	2000	*	3600	4600	1040	27	3
2000		370	1800	2510	5200	7600	1930	28	3
1999		480	2400	2470	4100	10000	1850	28	3
1998		700	1500	2740	4600	18000	3460	25	3
1997		280	1500	*	3400	5000	1140	27	3
1996		230	1400	1870	4400	4600	1440	30	3
1995		230	1900	2250	4700	7800	1800	30	3
1994		350	1900	2050	3900	4800	1250	29	3
1993		520	1600	2500	5600	8400	2060	29	3
1992		340	1900	2070	3300	4900	1060	31	3
1991		580	2400	3180	5100	12000	2440	29	3
1990		1700	3500	*	6600	9500	2240	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.