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	Annual Toxics Summary Burbank-W Palm Avenue 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		1800	*	*	*	9500	3220	5	2
2002		1400	4800	4610	6800	7700	1750	30	2
2001		360	3600	*	5800	6500	1560	28	3
2000		630	4000	3980	5500	9900	2040	31	3
1999		1800	4000	*	6700	9400	1890	25	3
1998		860	3300	3490	5000	7500	1510	29	3
1997		1600	4600	*	7000	8200	1950	29	3
1996		260	4500	*	5800	6700	1810	23	3
1995		540	4000	4330	7200	11000	2440	31	3
1994		950	4500	*	6800	10000	2020	27	3
1993		210	4700	4480	6900	8900	2220	31	3
1992		1200	4300	5700	6800	40000	7260	31	3
1991		720	5300	5850	9200	17000	3330	28	3
1990		3000	7200	*	11000	16000	3440	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.