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	Annual Toxics Summary Concord-2975 Treat Blvd 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	*
2011		*	*	*	*	*	*	0	*
2010		*	*	*	*	*	*	0	*
2009		*	*	*	*	*	*	0	*
2008		*	*	*	*	*	*	0	*
2007		*	*	*	*	*	*	0	*
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		*	*	*	*	*	*	0	*
2002		*	*	*	*	*	*	0	*
2001		*	*	*	*	*	*	0	*
2000		1	*	*	*	16	6.65	4	2.0
1999		3.0	8.0	11.3	17.4	62	11.3	27	2.0
1998		1	6.0	*	14	14	4.02	19	2.0
1997		4.0	8.5	*	11.9	14	2.73	22	2.0
1996		1	7.0	8.40	23	28	7.53	26	2.0
1995		1	10	11.6	22	42	9.57	27	2.0
1994		1	10	10.4	20.2	22	5.77	29	2.0
1993		3.0	8.0	12.4	25.4	38	8.80	27	2.0
1992		3.0	10.5	*	14.9	17	3.83	22	2.0
1991		4.0	10	14.2	23.6	38	8.53	27	2.0
1990		1.0	8.0	10.6	20.3	30	8.28	30	1.0
1989		2.0	12	12.1	23	28	7.45	56	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.