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	Annual Toxics Summary Bakersfield-5558 California Avenue 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		3.3	13	24.8	61.8	91	24.0	28	0.28
2023		2.9	16.6	30.6	66.9	192	36.1	31	2.86
2022		6.0	27.4	60.2	78.9	864	157	30	2.86
2021		5.4	24.4	*	60.4	71.2	19.7	24	2.86
2020		22.5	*	*	*	47.2	8.46	9	2.86
2019		14.3	40.6	49.1	95.7	159	34.7	34	2.86
2018		10.3	40.2	*	130	409	76.6	32	2.86
2017		6.7	40.7	60.6	100	235	52.4	33	2.86
2016		4.9	39.8	*	68.4	89.9	22.7	33	2.86
2015		1.43	36.2	49.4	110	228	46.6	33	2.86
2014		3.05	45.5	*	65	130	30.5	16	6.1
2013		14	30	*	71	120	28.6	21	1.5
2012		13	23.5	*	54.5	88	20.2	26	1.5
2011		5.0	40	*	87.8	200	40.9	25	1.5
2010		12	27	*	66.5	100	22.7	24	1.5
2009		9.4	31.5	*	61.9	93	20.1	24	1.5
2008		*	*	*	*	*	*	0	*
2007		7.5	34	31.7	45	71	13.6	31	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		11	*	*	*	59	17.2	5	1.0
2002		3.0	50	67.3	140	250	53.7	36	1.0
2001		1	38	41.3	67	150	27.7	39	2.0
2000		10	37.5	58.6	86.6	350	59.1	40	2.0
1999		11	52	72.5	130	310	63.4	39	2.0
1998		4.0	27	41.8	98.9	190	42.0	42	2.0
1997		6.0	22	33.7	62	140	28.4	34	2.0
1996		1	19	24.1	45.5	120	21.6	36	2.0
1995		4.0	30.5	31.3	52.3	110	21.2	30	2.0
1994		6.0	34	*	66.4	120	25.5	25	2.0
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.