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	Annual Toxics Summary El Cajon-Redwood Avenue FAQs Copper nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2024		*	*	*	*	*	*	0	*
2023		*	*	*	*	*	*	0	*
2022		*	*	*	*	*	*	0	*
2021		*	*	*	*	*	*	0	*
2020		*	*	*	*	*	*	0	*
2019		*	*	*	*	*	*	0	*
2018		*	*	*	*	*	*	0	*
2017		*	*	*	*	*	*	0	*
2016		*	*	*	*	*	*	0	*
2015		*	*	*	*	*	*	0	*
2014		12	*	*	*	31	8.76	4	6.1
2013		6.7	15.5	*	34.9	49	11.3	28	1.5
2012		5.0	14	*	24.8	33	7.54	23	1.5
2011		2.5	13	*	25.8	34	7.83	23	1.5
2010		8.5	19	*	31	36	8.18	21	1.5
2009		4.1	14	*	29.8	82	14.8	29	1.5
2008		*	*	*	*	*	*	0	*
2007		9.1	20.5	35.2	71.5	110	26.8	30	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		15	*	*	*	48	12.7	5	1.0
2002		5.0	20	30.1	63.4	98	23.4	29	1.0
2001		3.0	20.5	31.1	65.3	110	26.7	30	2.0
2000		8.0	33	*	70.9	120	29.4	14	2.0
1999		4.0	19.5	*	51.6	67	18.5	20	2.0
1998		4.0	18.5	22.6	43	61	14.5	24	2.0
1997		8.0	37	51.4	81.4	230	48.3	27	2.0
1996		13	36	42.5	57.4	170	29.7	27	2.0
1995		3.0	24	*	49	75	17.4	27	2.0
1994		6.0	40	*	58.6	75	15.1	27	2.0
1993		27	45	48.9	74.2	90	18.1	29	2.0
1992		7.0	43.5	45.3	69	110	22.5	26	2.0
1991		12	48	58.3	110	140	30.8	31	2.0
1990		14	38	*	67	240	53.8	15	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.