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	Annual Toxics Summary Burbank-W Palm 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	*
2022		*	*	*	*	*	*	0	*
2021		*	*	*	*	*	*	0	*
2020		*	*	*	*	*	*	0	*
2019		*	*	*	*	*	*	0	*
2018		*	*	*	*	*	*	0	*
2017		*	*	*	*	*	*	0	*
2016		*	*	*	*	*	*	0	*
2015		*	*	*	*	*	*	0	*
2014		0.75	0.75	*	5.9	7.2	2.23	12	1.5
2013		0.75	1.6	*	4.9	8.4	1.91	26	1.5
2012		0.75	0.75	1.78	3.2	9.1	1.71	29	1.5
2011		0.75	0.75	*	2.4	4.1	0.89	23	1.5
2010		0.75	0.75	*	2.3	2.9	0.70	26	1.5
2009		0.75	0.75	1.18	2.3	3.7	0.83	30	1.5
2008		*	*	*	*	*	*	0	*
2007		0.75	0.75	*	2.8	5.6	1.13	26	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		5.0	*	*	*	8.0	1.14	5	2.0
2002		4.0	7.0	8.38	13	22	3.86	30	2.0
2001		1	6.0	*	9.2	13	2.96	28	2.0
2000		1	6.0	5.93	9.0	13	2.74	31	2.0
1999		3.0	5.0	*	10.6	14	2.98	25	2.0
1998		1	4.0	4.25	7.0	8.0	1.88	29	2.0
1997		1	5.0	*	8.0	11	2.47	29	2.0
1996		1	5.0	*	8.6	18	3.57	23	2.0
1995		1	5.0	4.67	8.0	10	2.46	31	2.0
1994		1	5.0	*	8.0	14	2.94	27	2.0
1993		1	5.0	5.28	9.0	9.0	2.18	31	2.0
1992		1	4.0	5.86	7.0	43	9.32	31	2.0
1991		1	6.0	5.58	8.0	9.0	2.45	28	2.0
1990		1	6.0	*	10	13	3.00	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.