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	Annual Toxics Summary Chula Vista FAQs Strontium nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2024		2.6	3.9	*	7.0	7.7	1.68	13	0.57
2023		2.2	5.2	5.38	7.3	12.2	2.25	31	1.3
2022		3.1	5.4	5.98	9.3	12.6	2.33	31	1.3
2021		3.6	6.0	*	9.2	11.2	2.00	23	1.3
2020		0.65	*	*	*	10.1	3.03	8	1.3
2019		1.5	4.1	4.74	7.2	11.4	2.31	30	1.3
2018		2.1	6.2	6.22	8.3	11.5	2.10	31	1.3
2017		0.65	5.3	5.41	10.8	12.3	3.63	30	1.3
2016		2.2	5.9	*	12.4	14.7	3.33	27	1.3
2015		0.65	5.4	6.32	9.7	21.3	4.13	30	1.3
2014		1.3	5.8	6.43	9.8	15	3.15	31	1.2
2013		0.75	5.4	*	9.3	14	2.78	28	1.5
2012		2.2	4.3	6.18	10.3	26	4.85	29	1.5
2011		0.75	3.9	*	7.2	12	2.46	25	1.5
2010		0.75	3.5	3.66	5.5	6.8	1.35	28	1.5
2009		2.7	6.4	7.61	9.2	38	6.18	30	1.5
2008		*	*	*	*	*	*	0	*
2007		3.0	6.3	*	10.8	18	3.38	27	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		4.0	*	*	*	12	3.46	5	1.0
2002		4.0	8.0	8.36	12	19	3.32	30	1.0
2001		3.0	6.5	6.46	9.0	11	1.95	28	2.0
2000		3.0	6.0	*	11	12	2.81	11	2.0
1999		1	8.0	*	11.2	18	3.86	17	2.0
1998		3.0	7.0	7.35	10.4	12	2.45	27	2.0
1997		1	7.0	7.13	10.4	15	3.15	29	2.0
1996		1	5.0	6.06	10	12	2.99	30	2.0
1995		1	7.0	6.31	9.0	15	3.14	29	2.0
1994		2.0	6.0	6.46	9.1	15	2.69	30	2.0
1993		1	6.0	6.50	10	13	2.76	27	2.0
1992		1	6.0	6.17	10	20	3.73	28	2.0
1991		3.0	6.0	7.25	9.8	21	3.76	29	2.0
1990		3.0	8.0	*	14	15	3.42	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.