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	Annual Toxics Summary Chula Vista 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	5.7	*	18.3	21.3	6.52	20	2.86
2022		1.43	8.0	9.68	20.6	26.3	6.67	31	2.86
2021		4.2	7.9	*	22.5	36.4	8.08	23	2.86
2020		4.6	*	*	*	34.2	10.4	8	2.86
2019		3.5	13.1	16.8	36.7	41	12.1	30	2.86
2018		3.0	19.3	*	37.7	91.8	17.9	26	2.86
2017		1.43	18.4	20.7	40.6	56	15.2	30	2.86
2016		8.9	30.4	*	60.9	77.3	18.0	27	2.86
2015		7.6	20.1	24.4	36.1	66	12.8	30	2.86
2014		3.05	20	23.2	44	52	13.3	31	6.1
2013		3.8	25.5	*	44.2	79	17.5	28	1.5
2012		5.8	13	*	27.8	34	7.71	23	1.5
2011		2.3	13	*	18.2	27	6.34	19	1.5
2010		4.0	12	*	22	34	7.14	21	1.5
2009		4.8	13	*	29.4	49	10.0	25	1.5
2008		*	*	*	*	*	*	0	*
2007		5.9	16.5	20.7	43.4	59	14.3	30	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		30	*	*	*	99	25.2	5	1.0
2002		10	39	36.9	54.7	77	18.6	30	1.0
2001		5.0	23.5	32.0	54.1	120	24.2	28	2.0
2000		4.0	56	*	82	170	43.6	11	2.0
1999		1	37	*	69.6	110	26.0	17	2.0
1998		8.0	72	67.2	95.8	110	27.8	27	2.0
1997		8.0	61	68.3	98	180	31.6	29	2.0
1996		9.0	52	53.3	79.8	96	24.0	30	2.0
1995		10	46	45.2	75.8	80	20.1	29	2.0
1994		4.0	48.5	46.6	77.6	84	22.9	30	2.0
1993		12	71	77.5	110	170	34.9	27	2.0
1992		7.0	36.5	99.2	150	1000	201	28	2.0
1991		3.0	55	83.4	100	800	143	29	2.0
1990		9.0	39	*	65	220	49.0	16	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.