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	Annual Toxics Summary Azusa FAQs Copper nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2025		*	*	*	*	*	*	0	*
2024		*	*	*	*	*	*	0	*
2023		*	*	*	*	*	*	0	*
2022		8.8	24.3	*	42.7	408	80.8	23	2.86
2021		6.7	30.9	*	44.4	64.5	13.4	23	2.86
2020		9.8	*	*	*	45.1	16.1	7	2.86
2019		5.1	28.6	30.1	43.4	52	11.4	31	2.86
2018		7.3	31.3	*	58.2	75.7	17.1	25	2.86
2017		11.7	35.7	37.5	54.9	137	24.9	30	2.86
2016		9.0	32.6	35.6	56.7	102	20.2	31	2.86
2015		6.5	37.8	51.7	65.7	586	102	30	2.86
2014		3.05	32.5	34.5	64.8	100	23.8	30	6.1
2013		0.75	30.5	*	74.1	120	29.9	28	1.5
2012		5.6	22	*	45.8	71	15.5	25	1.5
2011		5.8	27	*	40.4	50	11.9	17	1.5
2010		6.3	20	*	45	53	15.2	16	1.5
2009		2.3	25.5	*	43	49	12.8	26	1.5
2008		*	*	*	*	*	*	0	*
2007		8.0	30	31.1	51.5	68	15.1	26	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		16	*	*	*	75	23.2	5	1.0
2002		13	47	42.4	59.5	70	16.7	26	1.0
2001		21	42	43.0	66.9	87	17.3	28	2.0
2000		17	36	37.0	56.6	88	16.3	28	2.0
1999		63	*	*	*	63	3.07	1	2.0
1998		*	*	*	*	*	*	0	*
1997		*	*	*	*	*	*	0	*
1996		*	*	*	*	*	*	0	*
1995		*	*	*	*	*	*	0	*
1994		*	*	*	*	*	*	0	*
1993		*	*	*	*	*	*	0	*
1992		*	*	*	*	*	*	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.