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	Annual Toxics Summary Chico-East Avenue FAQs Strontium nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2023		0.65	5.2	*	7.7	15.3	3.39	20	1.3
2022		0.65	4.5	*	7.5	12.7	2.84	28	1.3
2021		0.65	4.2	*	10.5	15.2	3.94	23	1.3
2020		0.65	*	*	*	4.8	1.73	7	1.3
2019		0.65	2.4	3.55	7.9	12.6	3.32	29	1.3
2018		0.65	3.7	6.60	9.9	57.5	10.3	31	1.3
2017		0.65	2.8	3.76	7.4	13.7	3.41	31	1.3
2016		0.65	2.7	*	8.3	19.8	3.99	32	1.3
2015		0.65	4.2	4.43	7.4	17.9	3.49	30	1.3
2014		0.6	3.5	3.59	6.0	9.5	2.33	31	1.2
2013		0.75	4.4	*	9.3	11	3.10	28	1.5
2012		0.75	2.9	*	5.2	30	6.68	18	1.5
2011		*	*	*	*	*	*	0	*
2010		*	*	*	*	*	*	0	*
2009		*	*	*	*	*	*	0	*
2008		*	*	*	*	*	*	0	*
2007		*	*	*	*	*	*	0	*
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		*	*	*	*	*	*	0	*
2002		*	*	*	*	*	*	0	*
2001		*	*	*	*	*	*	0	*
2000		*	*	*	*	*	*	0	*
1999		*	*	*	*	*	*	0	*
1998		*	*	*	*	*	*	0	*
1997		*	*	*	*	*	*	0	*
1996		*	*	*	*	*	*	0	*
1995		*	*	*	*	*	*	0	*
1994		*	*	*	*	*	*	0	*
1993		*	*	*	*	*	*	0	*
1992		*	*	*	*	*	*	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.