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	Annual Toxics Summary Los Angeles-North Main Street FAQs Copper nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2023		6.7	12.1	*	22.5	24.2	5.85	14	2.86
2022		1.43	24.2	31.5	40.6	231	41.9	27	2.86
2021		9.9	31.8	*	47.5	107	19.3	22	2.86
2020		16.2	*	*	*	64.9	16.9	7	2.86
2019		5.7	31.8	*	76.8	95	25.4	29	2.86
2018		13.2	40.6	*	93	101	29.1	23	2.86
2017		12	35.6	54.3	97.4	209	43.2	30	2.86
2016		10.3	34.6	37.3	71.2	104	23.5	31	2.86
2015		8.1	31.5	41.8	68.4	155	31.2	30	2.86
2014		3.05	28	34.5	62	100	22.7	29	6.1
2013		12	30	*	75.2	150	30.6	25	1.5
2012		6.7	28.5	*	39.5	41	10.3	16	1.5
2011		7.4	28	*	41	65	14.1	11	1.5
2010		7.1	27.5	*	40.4	55	12.5	14	1.5
2009		10	29	*	64.2	86	20.9	25	1.5
2008		*	*	*	*	*	*	0	*
2007		12	30	*	49.4	110	19.9	27	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		27	*	*	*	70	19.3	5	1.0
2002		22	52	53.9	84.6	95	21.1	29	1.0
2001		12	48	*	89.9	150	31.5	22	2.0
2000		10	48	49.7	77	160	29.4	31	2.0
1999		17	50	52.1	79.1	260	43.1	30	2.0
1998		1	35	*	48.5	64	13.8	26	2.0
1997		12	48	*	72.2	100	23.0	17	2.0
1996		8.0	52	49.7	91.4	190	37.4	29	2.0
1995		14	62.5	219	510	1500	322	28	2.0
1994		1	39.5	54.4	81	540	96.2	28	2.0
1993		11	37	*	72.6	81	20.6	23	2.0
1992		2.0	58	*	80	130	26.4	21	2.0
1991		15	45	48.4	74.8	95	22.2	28	2.0
1990		15	42	*	78.6	100	21.7	17	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.