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	Annual Toxics Summary Simi Valley-Cochran Street FAQs Chromium nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2023		4.255	4.255	*	4.255	4.255	0.0	19	8.51
2022		4.255	4.255	4.5	4.255	9	1.3	31	8.51
2021		4.255	4.255	*	4.255	9	1.3	22	8.51
2020		4.255	*	*	*	11	3.0	8	8.51
2019		4.255	4.255	*	4.255	4.255	0.0	27	8.51
2018		4.255	4.255	4.7	4.255	10	1.5	34	8.51
2017		4.255	4.255	5.0	9	12	2.0	29	8.51
2016		4.255	4.255	*	4.255	4.255	0.0	28	8.51
2015		4.255	4.255	4.3	4.255	4.255	0.0	30	8.51
2014		3.4	3.4	3.4	3.4	3.4	0.0	30	6.8
2013		4	4	*	3	4	0.6	26	3
2012		1.5	1.5	2.2	4	4	1.0	28	3
2011		1.5	4	*	5	10	2.0	27	3
2010		1.5	1.5	2.2	4	4	1.1	28	3
2009		1.5	1.5	2.7	4	5	1.3	31	3
2008		*	*	*	*	*	*	0	*
2007		1.5	1.5	*	5	5	1.4	25	3
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		1	*	*	*	2	0.5	4	2
2002		1	3	2.9	5	10	2.1	29	2
2001		1	2	*	4	5	1.2	24	2
2000		1	2	*	4	4	1.1	15	2
1999		1	3	*	5	7	1.7	27	2
1998		1	1	2.1	4	8	1.7	29	2
1997		1	2	2.3	4	5	1.3	31	2
1996		1	2	2.4	4	6	1.6	29	2
1995		1	2	3.1	5	10	2.5	31	2
1994		1	2	*	4	8	1.7	27	2
1993		1	3	3.0	5	7	1.9	31	2
1992		1	3	*	5	8	2.0	22	2
1991		1	3	3.1	5	8	2.0	28	2
1990		1	2	2.8	5	7	1.7	34	1
1989		0.5	2	2.2	4	5	1.3	57	1

	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.