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	Annual Toxics Summary Azusa FAQs Zinc nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2025		*	*	*	*	*	*	0	*
2024		*	*	*	*	*	*	0	*
2023		*	*	*	*	*	*	0	*
2022		26	68	*	130	161	36.9	23	9.98
2021		19	81	*	130	212	39.3	23	9.98
2020		22	*	*	*	130	40.3	7	9.98
2019		4.99	75	67.2	95	118	29.6	31	9.98
2018		15	55	*	140	158	42.0	24	9.98
2017		25	71	94.5	180	401	79.5	30	10
2016		15	64	78.2	130	353	64.6	31	10
2015		5	86	87.5	120	298	54.9	30	10
2014		4.2	53	60.9	100	150	36.4	30	8.4
2013		2.6	51	*	95	410	75.3	26	5.2
2012		14	40	*	89	120	27.4	23	9
2011		4.5	42	*	100	100	31.0	11	9
2010		21	*	*	*	130	31.3	9	9
2009		9	55	53.5	91	120	28.2	31	9
2008		*	*	*	*	*	*	0	*
2007		14	54	*	93	130	28.1	17	3
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		25	*	*	*	120	37.2	5	1
2002		26	90	97.1	140	330	63.1	26	1
2001		11	91	122	250	640	124	28	2
2000		32	110	125	180	290	57.7	28	2
1999		140	*	*	*	140	8.2	1	2
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.