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	Annual Statewide Toxics Summary Copper FAQs nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2017		1.43	18	26.8	53.4	226	25.2	407	2.86
2016		1.43	20.8	26.5	51.1	271	22.8	424	2.86
2015		1.43	20.2	28.0	51.1	586	36.4	418	2.86
2014		3.05	19	26.6	53	240	28.3	398	6.1
2013		0.75	23	*	58	170	24.0	431	1.5
2012		0.75	16	*	38	350	22.5	346	1.5
2011		0.75	18	*	43	200	21.8	311	1.5
2010		2.2	16	19.9	38	100	13.9	346	1.5
2009		1.9	16	*	41	93	15.4	440	1.5
2008		*	*	*	*	*	*	0	*
2007		2.5	20	24.8	46.4	140	19.2	467	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		2.0	29.5	*	65.5	110	22.3	86	1.0
2002		1.0	25	34.2	72	430	33.6	491	1.0
2001		1	20	28.0	56	210	25.6	505	2.0
2000		1	21	29.8	58	350	31.0	472	2.0
1999		1	20	29.2	61	430	34.7	565	2.0
1998		1	22	32.8	74	250	32.5	561	2.0
1997		2.0	26	36.8	81	880	48.6	557	2.0
1996		1	23	35.0	68.2	930	48.8	595	2.0
1995		1	25	40.2	69	1500	82.7	602	2.0
1994		1	24	34.0	63	540	37.7	585	2.0
1993		4.0	27	34.9	66.6	210	25.6	575	2.0
1992		2.0	26	36.0	59	1000	64.4	554	2.0
1991		1	22	34.0	66	800	45.7	567	2.0
1990		1	25	*	55.2	240	25.9	309	2.0
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.