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	Annual Toxics Summary Fresno-1st Street 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		*	*	*	*	*	*	0	*
2011		55	560	646	1200	2200	528	31	30
2010		63	520	707	1400	2900	607	29	30
2009		130	530	561	990	1100	295	33	30
2008		290	1400	1530	3100	3900	998	32	1
2007		62	930	971	1600	2600	611	28	30
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		160	*	*	*	910	255	7	1
2002		290	1200	1400	2400	3600	764	29	1
2001		85	1000	1300	2500	4400	953	32	2
2000		160	1200	1180	2000	3200	729	29	2
1999		100	1300	*	2800	6000	1310	25	2
1998		91	780	1080	2500	3800	970	26	2
1997		97	1200	1380	2600	5100	1170	30	2
1996		55	490	1040	2900	3200	1030	29	2
1995		120	1000	1300	3200	4200	1210	31	2
1994		190	1200	*	2300	2800	806	25	2
1993		150	1400	1510	3200	5500	1280	29	2
1992		350	1100	1450	3200	3900	1010	31	2
1991		180	1200	*	2900	4000	1120	25	2
1990		820	2400	*	4800	5000	1330	16	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.