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	Annual Toxics Summary Chula Vista FAQs Silicon nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
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		570	*	*	*	4500	1620	5	2
2002		720	2400	2770	4800	7400	1470	30	2
2001		660	2300	2390	3500	4700	999	28	3
2000		910	2000	*	4600	5600	1440	11	3
1999		170	2700	*	3100	7600	1710	17	3
1998		400	1900	2380	4100	5700	1290	27	3
1997		290	2600	2810	4600	7400	1570	29	3
1996		570	1600	1950	3700	5000	1160	30	3
1995		270	2400	2450	4400	6000	1380	29	3
1994		520	2700	2840	3900	8300	1530	30	3
1993		440	2200	2690	4200	7900	1710	27	3
1992		450	2400	2540	5000	6100	1500	28	3
1991		430	2200	2480	3700	6500	1260	29	3
1990		820	3200	*	7200	8400	2240	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.