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	Annual Toxics Summary El Cajon-Redwood Avenue FAQs Iron 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		*	*	*	*	*	*	0	*
2021		*	*	*	*	*	*	0	*
2020		*	*	*	*	*	*	0	*
2019		*	*	*	*	*	*	0	*
2018		*	*	*	*	*	*	0	*
2017		*	*	*	*	*	*	0	*
2016		*	*	*	*	*	*	0	*
2015		*	*	*	*	*	*	0	*
2014		470	*	*	*	1600	501	4	55
2013		200	850	*	1400	1800	430	28	30
2012		150	460	530	950	1800	407	29	30
2011		51	420	452	860	1100	287	31	30
2010		83	390	*	760	1100	249	25	30
2009		81	460	581	930	2200	441	31	30
2008		240	950	1090	2000	2700	614	28	1
2007		280	900	*	1900	3100	665	28	30
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		320	*	*	*	1500	483	5	1
2002		510	1300	1500	2300	3100	681	29	1
2001		210	1200	1250	2100	2700	702	30	2
2000		380	1300	*	2500	3000	792	14	2
1999		180	1000	*	2200	3900	869	20	2
1998		260	1000	1100	1900	2900	661	24	2
1997		140	1000	1030	1900	2100	568	27	2
1996		80	990	1200	2400	3300	781	27	2
1995		97	1200	*	2500	3500	829	27	2
1994		180	920	*	1500	2800	599	27	2
1993		130	970	1060	1900	2800	691	29	2
1992		50	890	1050	2200	2900	765	26	2
1991		200	930	1620	1800	15000	2550	31	2
1990		270	1100	*	2000	3000	659	15	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.