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

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2023		1.43	5.4	*	14.4	18.3	4.91	20	2.86
2022		1.43	6.2	*	12.3	55.8	9.92	28	2.86
2021		1.43	6.5	*	12.8	29.5	5.98	23	2.86
2020		1.43	*	*	*	15.4	4.53	7	2.86
2019		1.43	8.1	9.00	16.1	39.1	7.69	29	2.86
2018		2.9	9.5	*	15.7	44.6	8.61	26	2.86
2017		1.43	9.1	10.8	20.8	29.6	7.01	31	2.86
2016		1.43	7.0	*	20.6	44.2	9.13	32	2.86
2015		1.43	9.6	11.9	24.6	44.3	10.1	30	2.86
2014		3.05	7.4	9.10	17	27	6.46	31	6.1
2013		5.4	14	*	27	30	8.10	28	1.5
2012		2.3	13	*	24.6	29	8.72	14	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.