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	Annual Toxics Summary Riverside-Rubidoux FAQs Copper nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2025		7.0	24.6	*	43.2	53.2	14.8	16	2.86
2024		3.1	13.2	*	31.3	52.9	12.0	27	0.07
2023		4.8	13	*	18	23.1	4.85	25	2.86
2022		5.0	13.9	*	38.1	123	24.3	27	2.86
2021		7.6	17.8	*	31.5	52.6	11.5	21	2.86
2020		9.1	*	*	*	51.9	14.6	6	2.86
2019		4.3	16	18.7	29.3	76.3	13.6	29	2.86
2018		7.6	24	*	40.8	58.5	12.8	25	2.86
2017		1.43	20.8	23.4	42.6	68.7	15.6	29	2.86
2016		7.3	26.2	28.0	46.3	60	15.0	28	2.86
2015		5.3	23.4	*	43.7	102	20.8	28	2.86
2014		3.05	24	25.3	44.2	56	13.3	29	6.1
2013		6.8	21	*	53	100	20.9	29	1.5
2012		6.9	24	*	31	33	7.80	21	1.5
2011		3.5	23.5	*	43.5	110	23.7	18	1.5
2010		3.2	20	*	25.6	39	8.08	23	1.5
2009		5.4	26	*	37.8	47	10.0	27	1.5
2008		*	*	*	*	*	*	0	*
2007		6.9	23.5	*	53	60	15.8	22	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		23	*	*	*	60	16.5	5	1.0
2002		17	42	44.6	75	94	21.7	31	1.0
2001		5.0	30	34.2	56.1	88	18.0	30	2.0
2000		9.0	21	21.6	32.6	41	8.65	29	2.0
1999		1	22	22.6	43.1	52	13.3	28	2.0
1998		5.0	19.5	*	36.2	71	17.7	12	2.0
1997		13	*	*	*	13	19.3	1	2.0
1996		3.0	19	23.2	29.8	110	19.3	27	2.0
1995		4.0	18	23.3	31.1	140	25.7	30	2.0
1994		10	20	20.9	28.1	39	7.18	30	2.0
1993		7.0	20.5	21.1	31.3	36	8.56	28	2.0
1992		8.0	19	20.1	29	32	6.82	30	2.0
1991		1	16.5	17.6	27.1	40	8.87	30	2.0
1990		6.0	15	*	25	25	6.17	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.