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	Annual Toxics Summary Riverside-Rubidoux 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		890	*	*	*	9700	3530	5	2
2002		1600	8400	8680	13000	15000	3820	31	2
2001		160	7700	7520	13000	16000	4160	30	3
2000		850	6100	7430	12000	14000	3720	29	3
1999		1100	7800	7210	12000	15000	3750	28	3
1998		2600	7600	*	10000	11000	2520	12	3
1997		1500	*	*	*	1500	3350	1	3
1996		320	7000	6060	9700	11000	3350	27	3
1995		380	6300	7050	13000	15000	4290	30	3
1994		760	7400	7930	12000	14000	3700	30	3
1993		160	8300	8250	15000	17000	5290	28	3
1992		540	9100	8290	14000	16000	4900	30	3
1991		100	8300	9690	17000	23000	6040	30	3
1990		3100	9400	*	19000	24000	5570	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.