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	Annual Toxics Summary Chico-Manzanita 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		550	*	*	*	2200	651	5	2
2002		330	4200	4330	7200	8000	2450	31	2
2001		170	2500	3710	8500	11000	3240	32	3
2000		94	2700	3410	7500	8900	2630	31	3
1999		270	3400	4420	9800	14000	3670	30	3
1998		200	1700	3090	8100	13000	3240	32	3
1997		95	2600	3280	6400	12000	2600	30	3
1996		120	2600	3540	7400	11000	3060	29	3
1995		53	3600	3710	7000	8500	2780	29	3
1994		140	3700	4240	9500	13000	3490	30	3
1993		140	3500	3650	8900	16000	3700	29	3
1992		140	3800	*	13000	13000	4600	16	3
1991		*	*	*	*	*	*	0	*
1990		*	*	*	*	*	*	0	*
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.