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

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2023		0.65	24.6	*	41	99.5	22.5	20	1.3
2022		3.5	19.3	*	39.3	63.6	14.7	28	1.3
2021		1.6	17.8	*	62.5	94.5	23.9	23	1.3
2020		2.5	*	*	*	30.8	9.78	7	1.3
2019		0.65	10.3	18.3	46.3	74.9	20.8	29	1.3
2018		1.6	12.6	36.6	46.5	387	69.7	31	1.3
2017		0.65	11.7	20.8	43.3	90.4	22.2	31	1.3
2016		1.6	11.2	*	36.6	101	21.4	32	1.3
2015		1.8	20.6	22.3	46.7	50.2	14.6	30	1.3
2014		0.85	17	17.5	28	53	13.8	31	1.7
2013		1.2	21.5	*	55.7	67	18.8	28	1.0
2012		1.5	14	*	36.8	53	14.8	18	1.5
2011		*	*	*	*	*	*	0	*
2010		*	*	*	*	*	*	0	*
2009		*	*	*	*	*	*	0	*
2008		*	*	*	*	*	*	0	*
2007		*	*	*	*	*	*	0	*
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		*	*	*	*	*	*	0	*
2002		*	*	*	*	*	*	0	*
2001		*	*	*	*	*	*	0	*
2000		*	*	*	*	*	*	0	*
1999		*	*	*	*	*	*	0	*
1998		*	*	*	*	*	*	0	*
1997		*	*	*	*	*	*	0	*
1996		*	*	*	*	*	*	0	*
1995		*	*	*	*	*	*	0	*
1994		*	*	*	*	*	*	0	*
1993		*	*	*	*	*	*	0	*
1992		*	*	*	*	*	*	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.