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	Annual Toxics Summary Stockton-Hazelton Street 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		16	33	*	83	133	31.7	15	9.98
2020		16	*	*	*	169	62.7	7	9.98
2019		11	32	45.0	97	161	33.5	30	9.98
2018		4.99	39	*	96	246	54.0	26	9.98
2017		16	43	48.5	83	109	23.9	32	10
2016		5	38	42.0	73	96	23.0	32	10
2015		16	35	42.5	77	118	24.7	31	10
2014		4.2	20	31.9	66	100	26.5	31	8.4
2013		10	30	*	82	100	28.0	27	5.2
2012		10	28	*	47	86	16.2	27	9
2011		4.5	25	*	56	86	20.8	20	9
2010		11	23	*	41	60	12.8	19	9
2009		10	29	33.2	50	75	16.5	30	9
2008		*	*	*	*	*	*	0	*
2007		19	40	*	110	230	47.8	28	3
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		9	*	*	*	85	27.8	5	1
2002		2	38	39.1	71	110	24.0	35	1
2001		13	31	36.3	57	120	23.1	35	2
2000		9	32	43.4	95	120	30.1	33	2
1999		17	33	36.3	59	70	14.5	31	2
1998		14	31	42.2	77	120	29.2	31	2
1997		13	39	47.4	84	170	32.0	29	2
1996		8	35	40.0	63	91	17.6	32	2
1995		11	39	*	77	120	27.0	27	2
1994		19	59	70.7	140	220	49.3	34	2
1993		15	43	52.7	93	170	32.3	31	2
1992		9	35	38.6	65	79	17.9	30	2
1991		17	50	54.3	92	130	28.9	31	2
1990		16	51	*	74	190	39.0	17	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.