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	Annual Toxics Summary Chico-Manzanita Avenue FAQs Manganese nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
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		0.75	9.2	*	31.3	36	11.3	12	1.5
2011		1.9	8.1	14.7	32	75	15.7	31	1.5
2010		0.75	4.3	*	19.2	25	6.78	25	1.5
2009		0.75	11	12.0	21.1	42	9.27	30	1.5
2008		1.3	12	23.9	47	130	25.6	31	1.0
2007		0.75	12	13.7	24.1	54	11.3	30	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		3.0	*	*	*	11	3.36	5	1.0
2002		3.0	20	23.8	42	54	14.3	31	1.0
2001		1	13	19.5	42.9	61	17.7	32	2.0
2000		1	14	18.2	40	53	14.7	31	2.0
1999		1	15	23.0	59.1	80	20.9	30	2.0
1998		1	8.0	14.9	36.3	59	15.1	32	2.0
1997		1	12.5	16.6	33	78	15.1	30	2.0
1996		1	15	19.9	40.2	69	17.4	29	2.0
1995		1	17	20.1	39.4	56	15.8	29	2.0
1994		1	19.5	22.8	46.8	74	19.3	30	2.0
1993		1	20	19.6	49.2	78	18.0	29	2.0
1992		1	18.5	*	66.5	72	25.2	16	2.0
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.