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	Annual Toxics Summary Los Angeles-North Main Street FAQs Iron nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2024		190	670	*	1200	1280	342	12	2
2023		506	1100	*	2500	3220	753	24	69.4
2022		34.7	1200	1260	1800	2320	546	27	69.4
2021		513	1500	*	2200	3780	732	22	69.4
2020		428	*	*	*	2050	483	7	69.4
2019		34.7	1100	*	2000	2690	693	29	69.4
2018		300	1300	1390	2000	2330	561	28	69.4
2017		237	1100	1280	2300	3250	724	30	69.4
2016		210	980	1080	2000	3000	655	31	69.4
2015		200	770	1060	1800	3710	726	30	69.4
2014		500	960	1130	1600	2600	511	29	55
2013		410	1100	*	2100	4100	757	25	30
2012		170	860	*	1700	2300	548	23	30
2011		310	1100	*	1600	2800	574	14	30
2010		230	810	*	1300	1900	389	16	30
2009		170	930	1070	1900	2700	632	30	30
2008		350	1700	1730	2800	4600	927	28	1
2007		270	940	*	1500	3200	543	27	30
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		650	*	*	*	2200	579	5	1
2002		870	1800	1970	3000	3700	731	29	1
2001		180	1500	*	2100	2900	645	22	2
2000		170	1200	1210	1800	2300	572	31	2
1999		320	1500	1610	2700	3700	829	30	2
1998		14	1300	*	2000	2400	614	26	2
1997		230	1500	*	2100	4700	982	17	2
1996		170	1600	1440	2400	4800	953	29	2
1995		210	1500	1480	2500	3300	819	28	2
1994		200	1700	1830	2800	4300	966	28	2
1993		290	1600	*	2700	3200	820	23	2
1992		20	1700	*	2900	3400	856	21	2
1991		350	1700	1710	2900	3200	818	28	2
1990		440	2200	*	4100	6000	1440	17	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.