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	Annual Toxics Summary Chico-Manzanita Avenue FAQs Copper 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		6.1	*	*	*	15	3.61	8	1.5
2011		1.8	16	*	43.9	63	14.8	24	1.5
2010		4.0	14.5	*	23.6	46	9.72	20	1.5
2009		3.8	13	*	19.2	33	6.50	25	1.5
2008		*	*	*	*	*	*	0	*
2007		3.6	11	15.2	21	46	8.98	27	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		11	*	*	*	32	8.32	5	1.0
2002		5.0	16	22.8	48	78	16.0	31	1.0
2001		2.0	6.5	12.0	33.8	38	11.2	32	2.0
2000		2.0	9.0	13.7	23	52	12.6	31	2.0
1999		4.0	21	20.1	29.8	45	10.8	30	2.0
1998		3.0	28.5	49.5	120	250	57.1	32	2.0
1997		7.0	68.5	90.2	130	880	156	30	2.0
1996		6.0	76	114	150	930	167	29	2.0
1995		16	60	60.6	94.4	200	38.0	29	2.0
1994		34	71	94.2	210	390	79.7	30	2.0
1993		5.0	43	56.1	92.8	200	41.7	29	2.0
1992		2.0	8.5	*	16	37	8.35	16	2.0
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.