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	Annual Toxics Summary Concord-2975 Treat Blvd FAQs Chromium nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
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	*	*	*	2	0.6	4	2
1999		1	1	1.8	3	8	1.6	27	2
1998		1	1	*	3	4	1.0	19	2
1997		1	1	*	3	4	1.1	22	2
1996		1	1	2.0	4	7	1.6	26	2
1995		1	2	2.4	4	8	1.8	27	2
1994		1	2	2.3	4	8	1.6	29	2
1993		1	2	2.7	4	8	1.7	27	2
1992		1	1	*	4	11	2.3	22	2
1991		1	2	2.6	5	7	1.7	27	2
1990		1	2	2.1	4	7	1.6	30	1
1989		0.5	2	2.1	4	5	1.3	56	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.