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	Annual Toxics Summary Fremont-Chapel Way FAQs Zirconium 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	*
2011		*	*	*	*	*	*	0	*
2010		0.75	0.75	*	0.75	3.5	0.73	14	1.5
2009		0.75	0.75	0.75	0.75	0.75	0.00	31	1.5
2008		*	*	*	*	*	*	0	*
2007		0.75	0.75	0.95	0.75	4.4	0.82	27	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		1	*	*	*	14	5.15	5	2.0
2002		1	4.0	*	5.0	6.0	1.67	24	2.0
2001		1	2.0	*	4.0	7.0	1.47	27	2.0
2000		1	2.0	2.38	5.0	7.0	1.73	28	2.0
1999		1	1	2.01	4.0	9.0	1.85	28	2.0
1998		1	1	2.07	3.6	15	2.85	25	2.0
1997		1	1	*	4.0	6.0	1.33	28	2.0
1996		1	1	1.49	3.0	3.0	0.78	30	2.0
1995		1	1	2.04	4.0	5.0	1.35	30	2.0
1994		1	1	1.96	4.2	7.0	1.66	29	2.0
1993		1	2.0	2.14	4.2	6.0	1.53	29	2.0
1992		1	1	1.57	3.0	4.0	0.85	31	2.0
1991		1	2.0	2.44	4.2	6.0	1.43	29	2.0
1990		1	2.0	*	6.2	7.0	2.15	15	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.