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	Annual Statewide Toxics Summary Iron FAQs nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2017		34.7	900	1170	2400	7890	956	407	69.4
2016		34.7	930	1270	2800	6840	1090	424	69.4
2015		34.7	900	1200	2600	7860	1040	418	69.4
2014		27.5	940	1240	2600	9800	1080	398	55
2013		15	930	*	2200	5700	877	431	30
2012		15	560	726	1600	4000	597	463	30
2011		15	530	650	1400	3800	561	441	30
2010		15	440	592	1100	3200	477	428	30
2009		35	500	669	1400	2700	516	520	30
2008		58	1100	1360	2700	7800	1100	503	1
2007		57	770	938	1800	4500	675	471	30
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		160	890	*	1900	3800	674	86	1
2002		25	1300	1550	3100	7100	1120	491	1
2001		56	1000	1330	2700	7700	1060	505	2
2000		38	1100	1310	2600	6300	1000	472	2
1999		33	990	1290	2800	6900	1110	565	2
1998		14	780	1040	2200	6100	918	561	2
1997		30	900	1110	2200	5400	863	557	2
1996		25	860	1070	2300	7000	880	595	2
1995		27	920	1200	2600	5900	1050	602	2
1994		41	930	1150	2300	5100	862	585	2
1993		41	960	1210	2400	6300	1030	575	2
1992		20	880	1180	2400	15000	1130	554	2
1991		20	1000	1370	2800	15000	1270	567	2
1990		110	1400	*	3300	7700	1200	309	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.