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	Annual Toxics Summary Chico-East Avenue FAQs Iron nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2023		34.7	1200	*	2300	5760	1280	20	69.4
2022		136	1000	*	1700	3050	666	28	69.4
2021		89	880	*	2400	2740	789	23	69.4
2020		165	*	*	*	1470	455	7	69.4
2019		34.7	430	881	2300	3800	1010	29	69.4
2018		34.7	670	933	1800	3290	799	31	69.4
2017		34.7	640	941	2200	3180	844	31	69.4
2016		34.7	580	*	1900	5670	1120	32	69.4
2015		34.7	980	1010	1800	2480	634	30	69.4
2014		56	670	771	1400	2500	644	31	55
2013		100	940	*	2300	2900	754	28	30
2012		40	430	*	1100	1600	449	18	30
2011		*	*	*	*	*	*	0	*
2010		*	*	*	*	*	*	0	*
2009		*	*	*	*	*	*	0	*
2008		*	*	*	*	*	*	0	*
2007		*	*	*	*	*	*	0	*
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		*	*	*	*	*	*	0	*
2002		*	*	*	*	*	*	0	*
2001		*	*	*	*	*	*	0	*
2000		*	*	*	*	*	*	0	*
1999		*	*	*	*	*	*	0	*
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.