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	Annual Toxics Summary North Long Beach FAQs Iron nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2025		*	*	*	*	*	*	0	*
2024		*	*	*	*	*	*	0	*
2023		*	*	*	*	*	*	0	*
2022		*	*	*	*	*	*	0	*
2021		*	*	*	*	*	*	0	*
2020		*	*	*	*	*	*	0	*
2019		*	*	*	*	*	*	0	*
2018		*	*	*	*	*	*	0	*
2017		*	*	*	*	*	*	0	*
2016		*	*	*	*	*	*	0	*
2015		*	*	*	*	*	*	0	*
2014		*	*	*	*	*	*	0	*
2013		310	700	*	1200	1400	329	20	30
2012		190	610	699	1400	1700	401	29	30
2011		160	600	615	1200	1400	343	29	30
2010		120	520	*	880	1200	285	23	30
2009		140	640	772	1300	2200	495	29	30
2008		250	940	1150	1900	4200	777	29	1
2007		320	810	*	1600	2600	520	26	30
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		890	*	*	*	1600	324	4	1
2002		350	950	*	1700	2000	447	27	1
2001		290	1100	1080	1700	2400	540	28	2
2000		370	990	*	1700	4900	859	29	2
1999		330	1100	1250	2500	4800	1070	26	2
1998		180	670	884	1600	1900	468	29	2
1997		110	1200	1230	2000	2900	654	30	2
1996		550	1100	*	1900	7000	1320	23	2
1995		210	1200	1280	2000	3000	598	29	2
1994		310	1200	1270	1800	3200	601	29	2
1993		200	1200	1260	2000	3900	765	30	2
1992		200	1300	1260	2000	2500	577	30	2
1991		470	1300	1360	1900	3300	694	28	2
1990		600	1400	*	3400	4400	1090	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.