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	Annual Toxics Summary North Long Beach 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		1900	*	*	*	5600	1710	4	2
2002		1200	2800	*	4700	5600	1190	27	2
2001		600	2900	2950	5000	5700	1430	28	3
2000		1200	2800	*	4700	15000	2580	29	3
1999		1000	3000	3610	6700	14000	3010	26	3
1998		400	2300	2500	4000	6600	1390	29	3
1997		330	3500	3500	6000	7600	1960	30	3
1996		1200	3200	*	6100	15000	2900	23	3
1995		540	3300	3810	6500	8400	1950	29	3
1994		800	3300	3710	5500	7900	1720	29	3
1993		320	3500	3700	6100	11000	2250	30	3
1992		560	4000	3990	6700	8500	1820	30	3
1991		1400	3900	4450	6400	13000	2380	28	3
1990		1800	4800	*	13000	15000	3960	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.