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	Annual Toxics Summary North Long Beach FAQs Zirconium 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		*	*	*	*	*	*	0	*
2021		*	*	*	*	*	*	0	*
2020		*	*	*	*	*	*	0	*
2019		*	*	*	*	*	*	0	*
2018		*	*	*	*	*	*	0	*
2017		*	*	*	*	*	*	0	*
2016		*	*	*	*	*	*	0	*
2015		*	*	*	*	*	*	0	*
2014		*	*	*	*	*	*	0	*
2013		0.75	0.75	*	0.75	4.3	1.01	20	1.5
2012		0.75	0.75	1.04	1.9	3.2	0.73	29	1.5
2011		0.75	0.75	1.02	1.8	3.2	0.63	29	1.5
2010		0.75	0.75	*	2.0	2.8	0.62	23	1.5
2009		0.75	0.75	1.06	2.1	3.1	0.64	29	1.5
2008		*	*	*	*	*	*	0	*
2007		0.75	0.75	*	1.9	3.0	0.66	26	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		4.0	*	*	*	7.0	1.41	4	2.0
2002		1	5.0	*	8.4	14	2.95	27	2.0
2001		1	4.0	5.13	9.3	22	4.40	28	2.0
2000		1	4.0	*	8.0	15	3.16	29	2.0
1999		1	4.0	5.08	11.5	17	4.39	26	2.0
1998		1	3.0	3.29	6.0	9.0	2.12	29	2.0
1997		1	5.0	6.03	14.1	16	4.69	30	2.0
1996		1	4.0	*	11.4	35	8.06	23	2.0
1995		1	4.0	5.65	9.2	26	5.30	29	2.0
1994		1	5.0	5.29	9.2	14	3.35	29	2.0
1993		1	4.5	6.46	12	26	6.11	30	2.0
1992		1	4.5	5.60	8.3	26	4.68	30	2.0
1991		1	5.0	5.38	10	12	2.80	28	2.0
1990		1	5.5	*	16	17	5.33	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.