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	Annual Toxics Summary San Jose-4th Street 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	*
2009		*	*	*	*	*	*	0	*
2008		*	*	*	*	*	*	0	*
2007		*	*	*	*	*	*	0	*
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		*	*	*	*	*	*	0	*
2002		1	*	*	*	7.0	1.99	10	2.0
2001		1	3.0	3.57	6.1	10	2.33	30	2.0
2000		1	3.0	3.88	7.0	11	2.58	28	2.0
1999		1	3.0	2.96	5.0	9.0	1.86	30	2.0
1998		1	2.0	2.71	5.2	8.0	2.05	29	2.0
1997		1	2.0	2.44	5.1	6.0	1.77	30	2.0
1996		1	2.0	2.36	4.0	6.0	1.31	28	2.0
1995		1	2.0	2.50	5.1	7.0	1.90	30	2.0
1994		1	2.0	2.36	5.0	6.0	1.55	31	2.0
1993		1	3.0	3.19	4.2	10	1.83	29	2.0
1992		1	3.0	3.07	5.0	8.0	1.73	30	2.0
1991		1	3.0	3.51	6.6	10	2.23	28	2.0
1990		1	4.0	*	6.6	9.0	1.92	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.