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	Annual Toxics Summary Los Angeles-North Main Street 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		1200	*	*	*	7500	2360	5	2
2002		1700	4700	4730	6700	8100	1690	29	2
2001		350	3300	*	5000	8900	1820	22	3
2000		270	3300	3120	4500	7000	1640	31	3
1999		770	3500	4090	7300	8900	2060	30	3
1998		42	3200	*	4900	6600	1570	26	3
1997		430	3300	*	4700	6400	1450	16	3
1996		200	4300	3670	5900	12000	2370	29	3
1995		560	3700	3960	7000	7700	2190	28	3
1994		600	4400	4890	8200	11000	2590	28	3
1993		460	4100	*	6700	8600	2250	23	3
1992		44	5000	*	7500	8500	2280	21	3
1991		890	4500	5150	8400	11000	2480	28	3
1990		1700	6300	*	14000	16000	4170	17	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.