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	Annual Toxics Summary North Long Beach FAQs Zinc nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2023		*	*	*	*	*	*	0	*
2022		*	*	*	*	*	*	0	*
2021		*	*	*	*	*	*	0	*
2020		*	*	*	*	*	*	0	*
2019		*	*	*	*	*	*	0	*
2018		*	*	*	*	*	*	0	*
2017		*	*	*	*	*	*	0	*
2016		*	*	*	*	*	*	0	*
2015		*	*	*	*	*	*	0	*
2014		*	*	*	*	*	*	0	*
2013		19	36	*	68	90	18.8	17	5.2
2012		21	53	*	84	100	21.8	20	9
2011		15	50	*	92	120	27.2	21	9
2010		13	46	*	87	250	56.3	16	9
2009		13	55	*	110	210	39.8	26	9
2008		*	*	*	*	*	*	0	*
2007		24	73	*	110	220	44.5	21	3
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		50	*	*	*	110	28.0	4	1
2002		23	66	*	110	130	30.9	27	1
2001		16	64	73.3	160	230	50.9	28	2
2000		19	63	*	110	230	44.1	29	2
1999		16	70	85.6	200	280	71.0	26	2
1998		15	47	60.3	120	130	34.6	29	2
1997		12	68	81.1	140	280	57.4	30	2
1996		37	74	*	150	610	119	23	2
1995		32	70	111	240	440	93.2	29	2
1994		25	89	125	230	310	79.2	29	2
1993		16	71	90.8	170	340	68.7	30	2
1992		17	76	91.3	170	220	53.4	30	2
1991		25	87	93.9	140	280	56.8	28	2
1990		29	77	*	170	200	51.5	16	2
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.