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	Annual Toxics Summary Chico-Manzanita Avenue 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		1.5	4	*	5	5	0.9	12	3
2011		1.5	4	*	5	8	1.6	27	3
2010		1.5	3	3.3	7	8	2.1	30	3
2009		1.5	1.5	2.5	4	5	1.2	30	3
2008		*	*	*	*	*	*	0	*
2007		1.5	1.5	*	4	5	1.2	28	3
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		1	*	*	*	1	0.0	5	2
2002		1	3	3.1	5	6	1.8	31	2
2001		1	1	2.9	7	10	2.6	32	2
2000		1	1	2.5	6	8	2.0	31	2
1999		1	3	3.7	7	14	2.9	30	2
1998		1	1	2.6	6	11	2.5	32	2
1997		1	2	2.8	5	11	2.3	30	2
1996		1	4	3.5	7	10	2.6	29	2
1995		1	2	3.3	7	8	2.6	29	2
1994		1	3	3.8	8	11	2.9	30	2
1993		1	4	3.7	8	14	3.2	29	2
1992		1	3	*	11	12	4.2	16	2
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.