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	Annual Toxics Summary Chula Vista FAQs Zinc nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2025		4.99	27	*	110	136	40.5	12	9.98
2024		5	27	30.5	51	72	16.9	28	2.4
2023		4.99	26	29.5	50	92	19.3	31	9.98
2022		4.99	24	28.3	57	69	17.1	31	9.98
2021		13	27	*	55	60	15.8	23	9.98
2020		15	*	*	*	71	21.8	8	9.98
2019		4.99	24	30.7	66	92	22.2	30	9.98
2018		4.99	35	*	62	112	24.6	25	9.98
2017		5	25	32.0	64	82	22.1	30	10
2016		5	36	*	80	88	24.2	27	10
2015		5	23	29.5	61	82	20.4	30	10
2014		4.2	17	22.1	48	65	16.9	31	8.4
2013		2.6	22	*	41	54	13.4	24	5.2
2012		10	25	*	42	63	13.3	20	9
2011		9	17	*	40	51	12.8	21	9
2010		4.5	17	*	30	64	13.7	15	9
2009		4.5	35	36.1	57	72	16.0	30	9
2008		*	*	*	*	*	*	0	*
2007		16	35	*	62	87	19.1	19	3
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		16	*	*	*	82	24.7	5	1
2002		14	42	48.2	88	110	25.2	30	1
2001		11	35	40.1	72	130	25.9	28	2
2000		13	36	*	79	100	27.1	11	2
1999		1	21	*	39	100	22.9	17	2
1998		15	29	36.0	57	62	15.9	27	2
1997		11	34	36.7	56	81	17.5	29	2
1996		4	24	30.7	54	85	19.5	30	2
1995		9	28	32.0	57	110	21.2	29	2
1994		9	28	34.8	55	150	27.1	30	2
1993		11	29	37.8	67	76	20.1	27	2
1992		8	24	30.6	52	78	18.3	28	2
1991		7	22	30.2	51	82	18.7	29	2
1990		15	30	*	60	85	19.0	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.