California Home	ARB:	Home	Search	Site Map				Contact Us

	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
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.