California Home	ARB:	Home	Search	Site Map				Contact Us

	Annual Toxics Summary San Francisco-Arkansas Street FAQs Iron nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2024		135	350	*	770	911	221	13	50
2023		80	400	539	980	1490	322	26	69.4
2022		34.7	360	529	1100	1880	374	31	69.4
2021		104	350	*	700	1460	295	23	69.4
2020		229	*	*	*	1690	556	9	69.4
2019		71	480	710	1200	3430	712	29	69.4
2018		34.7	700	795	1200	2410	560	30	69.4
2017		86	650	879	1400	3200	715	28	69.4
2016		111	440	573	1300	1970	466	30	69.4
2015		34.7	420	553	1000	1620	366	30	69.4
2014		110	500	636	970	3200	586	30	55
2013		91	500	*	1500	1800	508	28	30
2012		15	280	371	840	1300	340	30	30
2011		15	370	431	710	1300	272	29	30
2010		79	240	*	790	1500	331	28	30
2009		67	290	358	720	880	238	31	30
2008		210	550	644	1100	2100	470	31	1
2007		130	440	539	1200	1900	429	28	30
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		600	*	*	*	1700	381	6	1
2002		200	630	899	1700	5200	942	30	1
2001		160	540	805	2000	2500	660	31	2
2000		280	860	*	1700	2100	597	19	2
1999		120	530	*	1100	1300	308	20	2
1998		210	520	610	1200	1600	349	26	2
1997		140	600	744	1500	2100	502	28	2
1996		66	530	773	1500	2600	593	26	2
1995		92	530	706	1600	2100	593	30	2
1994		92	490	705	1500	2800	594	30	2
1993		110	600	837	1600	2100	552	27	2
1992		180	470	*	970	2100	484	16	2
1991		180	520	*	1100	3500	707	25	2
1990		150	490	*	1100	1700	426	14	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.