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	Annual Toxics Summary Fremont-Chapel Way 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		*	*	*	*	*	*	0	*
2013		*	*	*	*	*	*	0	*
2012		*	*	*	*	*	*	0	*
2011		*	*	*	*	*	*	0	*
2010		48	220	*	390	420	111	17	30
2009		46	240	316	550	840	209	31	30
2008		120	380	534	1000	1800	385	30	1
2007		130	400	540	960	1900	424	28	30
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		290	*	*	*	820	206	5	1
2002		160	720	*	1200	1400	369	24	1
2001		160	620	*	1000	1600	342	27	2
2000		150	480	695	1300	2000	503	28	2
1999		140	680	749	1300	2800	526	28	2
1998		210	510	823	1500	5000	959	25	2
1997		97	490	*	1200	2200	457	28	2
1996		110	440	569	1100	1500	403	30	2
1995		76	550	658	1400	2200	524	30	2
1994		100	550	625	1300	1500	372	29	2
1993		130	500	720	1400	2300	567	29	2
1992		82	510	544	950	1200	284	31	2
1991		130	580	764	1400	2800	599	29	2
1990		340	800	*	1600	2200	539	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.