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	Annual Toxics Summary Chico-Manzanita Avenue 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		*	*	*	*	*	*	0	*
2021		*	*	*	*	*	*	0	*
2020		*	*	*	*	*	*	0	*
2019		*	*	*	*	*	*	0	*
2018		*	*	*	*	*	*	0	*
2017		*	*	*	*	*	*	0	*
2016		*	*	*	*	*	*	0	*
2015		*	*	*	*	*	*	0	*
2014		*	*	*	*	*	*	0	*
2013		*	*	*	*	*	*	0	*
2012		61	310	*	960	1000	327	12	30
2011		15	260	489	1000	2400	509	31	30
2010		53	230	367	760	940	267	30	30
2009		40	350	378	660	1300	271	30	30
2008		120	720	1010	2300	2700	753	31	1
2007		57	480	*	960	1500	360	27	30
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		190	*	*	*	600	168	5	1
2002		100	1000	1090	1800	2200	615	31	1
2001		57	570	912	2100	2800	810	32	2
2000		38	620	828	1900	2000	626	31	2
1999		77	720	1100	2300	3900	947	30	2
1998		65	420	769	2000	3300	792	32	2
1997		45	650	831	1700	3300	677	30	2
1996		25	750	930	1900	2800	788	29	2
1995		27	830	919	1900	2000	711	29	2
1994		41	890	1020	2300	3200	844	30	2
1993		74	870	936	2200	4200	937	29	2
1992		36	830	*	3200	3600	1200	16	2
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.