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	Annual Toxics Summary Chico-Manzanita Avenue FAQs Strontium 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		*	*	*	*	*	*	0	*
2012		0.75	1.9	*	3.7	5.7	1.60	12	1.5
2011		0.75	2.0	2.58	5.7	10	2.32	31	1.5
2010		0.75	1.9	2.26	4.6	7.2	1.78	30	1.5
2009		0.75	3.2	3.12	5.6	8.6	2.08	30	1.5
2008		*	*	*	*	*	*	0	*
2007		0.75	3.3	*	6.6	13	2.88	26	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		1.0	*	*	*	4.0	1.14	5	1.0
2002		1.0	7.0	6.04	9.0	10	2.49	31	1.0
2001		1	3.5	4.54	9.9	13	3.59	32	2.0
2000		1	4.0	4.72	8.0	27	4.88	31	2.0
1999		1	4.0	5.40	10.2	20	4.33	30	2.0
1998		1	3.0	3.93	8.9	13	3.66	32	2.0
1997		1	3.0	3.72	8.0	14	2.98	30	2.0
1996		1	3.0	3.92	7.2	10	3.02	29	2.0
1995		1	4.0	3.64	7.0	8.0	2.48	29	2.0
1994		1	4.0	4.32	9.1	12	3.35	30	2.0
1993		1	4.0	4.21	9.2	17	3.86	29	2.0
1992		1	3.5	*	12	15	4.69	16	2.0
1991		*	*	*	*	*	*	0	*
1990		*	*	*	*	*	*	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.