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	Annual Toxics Summary Stockton-Hazelton 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		336	1300	*	2400	3430	833	15	69.4
2020		106	*	*	*	2970	919	7	69.4
2019		141	850	1120	2400	4630	1110	30	69.4
2018		232	1100	1230	2300	4090	901	32	69.4
2017		252	990	1200	1900	4460	819	32	69.4
2016		34.7	940	1080	1500	3950	733	32	69.4
2015		272	1200	1310	2100	3390	693	31	69.4
2014		84	960	1170	2000	3800	829	31	55
2013		380	1000	*	2600	3100	801	30	30
2012		72	610	672	1100	1700	407	30	30
2011		120	470	562	1300	1700	449	31	30
2010		130	430	468	810	1500	307	28	30
2009		35	380	499	950	1100	289	32	30
2008		320	1200	1410	2900	3900	965	33	1
2007		190	960	*	2200	3100	746	34	30
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		450	*	*	*	1300	326	5	1
2002		25	1300	1280	2000	4100	794	35	1
2001		300	870	1130	1900	4400	845	35	2
2000		170	930	1100	1900	3900	719	33	2
1999		260	1100	1220	1800	6700	1120	31	2
1998		240	1000	1200	1800	5100	977	31	2
1997		230	1400	1490	2300	4700	919	29	2
1996		210	1300	1150	2000	2300	608	32	2
1995		270	940	*	2500	4500	1110	27	2
1994		160	1400	1310	1900	3300	720	34	2
1993		250	1200	1570	3000	6100	1170	31	2
1992		210	1300	1350	2300	3400	774	30	2
1991		420	1700	1910	3200	5600	1140	31	2
1990		550	1600	*	3900	4900	1280	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.