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

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2025		0.65	6.3	*	11.5	14.9	4.00	15	1.3
2024		0.35	8.3	8.96	15.5	20	5.01	30	0.7
2023		0.65	8.2	9.14	14.2	25.6	5.60	29	1.3
2022		0.65	9.3	9.93	18.3	22.4	5.53	31	1.3
2021		1.6	10.2	*	21.4	23.5	6.02	22	1.3
2020		0.65	*	*	*	19.6	6.64	8	1.3
2019		0.65	7.6	8.95	17.9	32.3	6.83	29	1.3
2018		0.65	10.6	11.4	21.1	24.9	6.42	34	1.3
2017		1.4	11.9	12.9	22.9	28.1	7.22	29	1.3
2016		2.3	13.3	*	19.1	27.3	6.51	28	1.3
2015		0.65	10.3	9.00	13.9	14.5	3.81	30	1.3
2014		0.85	13	12.4	18.3	26	6.49	30	1.7
2013		0.5	12.5	*	19	26	6.38	26	1.0
2012		1.5	10.5	11.1	18.9	26	6.69	28	1.5
2011		0.75	8.3	11.2	19.1	30	7.20	30	1.5
2010		0.75	7.0	*	13	15	4.20	26	1.5
2009		0.75	9.7	10.8	19	23	6.68	31	1.5
2008		0.5	15	16.3	26.2	52	11.3	29	1.0
2007		2.5	13	*	25	46	9.06	27	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		3.0	*	*	*	26	10.4	4	1.0
2002		5.0	21	19.2	31.2	48	10.2	29	1.0
2001		3.0	15.5	*	31.8	40	10.3	24	2.0
2000		1	12	*	20.2	22	6.38	15	2.0
1999		2.0	19	*	29	37	9.59	27	2.0
1998		1	11	11.2	20.2	41	8.41	29	2.0
1997		1	10	12.9	22	36	7.54	31	2.0
1996		1	16	14.5	26.6	31	8.74	29	2.0
1995		1	14	18.1	34	50	13.1	31	2.0
1994		2.0	15	*	26.4	43	9.65	27	2.0
1993		1	13	16.5	34	42	11.8	31	2.0
1992		3.0	16	*	27	44	11.0	22	2.0
1991		2.0	21.5	22.4	37.6	48	11.3	28	2.0
1990		2.0	18.5	24.1	43.4	60	15.4	34	1.0
1989		1.0	17	19.8	37.8	53	12.0	57	1.0

	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.