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	Annual Toxics Summary Azusa FAQs Iron nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2023		*	*	*	*	*	*	0	*
2022		877	2200	*	5800	8500	1980	23	69.4
2021		372	3700	*	5800	8350	2090	23	69.4
2020		479	*	*	*	2540	902	7	69.4
2019		136	2100	2140	3400	4570	1100	31	69.4
2018		470	2300	2330	3700	5200	1240	30	69.4
2017		541	2100	2240	3300	7890	1440	30	69.4
2016		243	2500	2410	4300	5200	1390	31	69.4
2015		129	2400	2640	5000	7440	1680	30	69.4
2014		220	2400	2700	4500	7300	1540	30	55
2013		15	1800	*	4500	5700	1530	28	30
2012		80	790	1030	2300	2400	716	30	30
2011		85	1000	*	2200	3100	749	20	30
2010		100	810	*	1800	2600	637	16	30
2009		170	800	1080	2100	2600	758	31	30
2008		220	1800	2100	4300	6300	1440	29	1
2007		150	1400	1420	2600	3000	737	27	30
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		850	*	*	*	2800	894	5	1
2002		760	3000	3010	5800	7100	1850	26	1
2001		75	3100	3010	5100	7700	1780	28	2
2000		150	2400	2560	5100	6300	1580	28	2
1999		4600	*	*	*	4600	111	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.