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	Annual Toxics Summary Simi Valley-Cochran Street FAQs Iron nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2024		79	270	*	700	729	226	13	7.3
2023		34.7	460	516	880	1130	291	29	69.4
2022		34.7	520	590	1100	1320	314	31	69.4
2021		126	640	*	1100	1230	322	22	69.4
2020		34.7	*	*	*	930	339	8	69.4
2019		34.7	460	508	1100	1570	374	29	69.4
2018		34.7	570	646	1200	1490	369	34	69.4
2017		34.7	700	714	1300	1560	416	29	69.4
2016		146	760	*	1200	1300	356	28	69.4
2015		34.7	550	514	810	906	228	30	69.4
2014		73	720	723	1000	1500	323	30	55
2013		15	680	*	1100	1100	347	26	30
2012		82	460	474	790	900	258	28	30
2011		15	420	504	910	1400	345	30	30
2010		47	360	407	750	930	246	28	30
2009		39	400	486	960	1000	292	31	30
2008		58	970	1050	1700	2900	667	29	1
2007		150	680	*	1100	1300	316	25	30
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		230	*	*	*	970	358	4	1
2002		250	1100	1100	1700	2900	588	29	1
2001		110	880	*	1700	2000	535	24	2
2000		82	720	*	1100	1200	333	15	2
1999		150	1100	*	1700	2200	566	27	2
1998		37	630	676	1200	1900	447	29	2
1997		86	730	803	1400	2200	470	31	2
1996		51	940	856	1600	1800	518	29	2
1995		56	760	994	2000	2500	700	31	2
1994		120	840	*	1500	2500	554	27	2
1993		41	760	919	1900	2400	647	31	2
1992		150	860	*	1600	2700	650	22	2
1991		79	1100	1100	1800	2300	561	28	2
1990		200	1400	*	2900	3500	981	16	2
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.