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

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2023		0.65	0.65	*	2.1	3.7	0.81	20	1.3
2022		0.65	0.65	*	1.9	2.9	0.61	28	1.3
2021		0.65	0.65	*	2.5	2.8	0.78	23	1.3
2020		0.65	*	*	*	1.4	0.29	7	1.3
2019		0.65	0.65	1.12	2.6	2.9	0.80	29	1.3
2018		0.65	0.65	1.08	2.3	4.5	0.89	31	1.3
2017		0.65	0.65	0.96	2.2	3.0	0.71	31	1.3
2016		0.65	0.65	*	1.5	4.1	0.70	32	1.3
2015		0.65	0.65	0.96	1.6	2.0	0.49	30	1.3
2014		0.75	0.75	1.15	2.0	4.2	0.97	31	1.5
2013		0.75	0.75	*	0.75	3.3	0.47	28	1.5
2012		0.75	0.75	*	0.75	0.75	0.00	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.