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

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2024		*	*	*	*	*	*	0	*
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	0.75	*	0.75	0.75	0.00	12	1.5
2011		0.75	0.75	0.75	0.75	0.75	0.00	31	1.5
2010		0.75	0.75	0.75	0.75	0.75	0.00	29	1.5
2009		0.75	0.75	0.75	0.75	0.75	0.00	30	1.5
2008		*	*	*	*	*	*	0	*
2007		0.75	0.75	*	0.75	46	8.55	28	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		1	*	*	*	4.0	1.14	5	2.0
2002		1	3.0	3.01	5.0	6.0	1.66	31	2.0
2001		1	1	2.42	5.0	6.0	1.86	32	2.0
2000		1	2.0	2.39	5.0	6.0	1.56	31	2.0
1999		1	1	2.61	6.0	9.0	2.18	30	2.0
1998		1	1	1.97	4.0	10	1.94	32	2.0
1997		1	1	2.14	4.1	7.0	1.68	30	2.0
1996		1	1	2.21	4.0	7.0	1.69	29	2.0
1995		1	2.0	2.42	4.0	6.0	1.45	29	2.0
1994		1	2.0	2.81	6.1	8.0	2.21	30	2.0
1993		1	3.0	2.79	5.4	9.0	2.17	29	2.0
1992		1	1	*	7.0	9.0	2.78	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.