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	Annual Toxics Summary El Cajon-Redwood Avenue 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		920	*	*	*	5000	1660	5	2
2002		1400	4200	4550	6800	9000	1880	29	2
2001		590	3900	3890	6300	8000	2000	30	3
2000		1100	4500	*	7700	10000	2400	14	3
1999		690	3400	*	6800	10000	2350	20	3
1998		770	3100	3470	5600	8900	1960	24	3
1997		380	3200	3330	5900	6100	1690	27	3
1996		260	3200	3600	7100	9000	2250	27	3
1995		320	3800	*	7500	14000	2800	27	3
1994		570	3300	*	5100	8900	1840	27	3
1993		360	3400	3660	6300	9700	2280	29	3
1992		160	3400	3840	7600	9100	2600	26	3
1991		800	4000	6370	6400	62000	10600	31	3
1990		980	4700	*	7800	12000	2710	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.