California Home	ARB:	Home	Search	Site Map				Contact Us

	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
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.