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	Annual Toxics Summary Bakersfield-5558 California Avenue 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		244	1800	2160	4300	4720	1320	28	37
2023		193	1900	2080	3300	5510	1170	31	69.4
2022		490	2300	2210	4100	5960	1350	30	69.4
2021		173	2700	*	5600	6170	1600	24	69.4
2020		735	*	*	*	2990	817	9	69.4
2019		390	1900	2210	4500	5990	1420	34	69.4
2018		222	2000	2120	4100	5090	1350	37	69.4
2017		144	1800	1970	3500	4670	1090	33	69.4
2016		408	2400	*	4000	5030	1340	33	69.4
2015		34.7	1800	1980	3500	7860	1470	33	69.4
2014		240	2600	*	4700	9800	2250	16	55
2013		710	1800	*	2800	4700	997	21	30
2012		420	1200	1490	2700	4000	903	32	30
2011		100	1000	1200	2400	3800	934	32	30
2010		120	680	910	2200	3200	765	29	30
2009		250	900	983	1700	2300	543	29	30
2008		750	2400	2890	5400	7800	1770	31	1
2007		200	1400	1310	2100	4500	817	32	30
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		850	*	*	*	1300	216	5	1
2002		390	2100	2350	4100	5700	1260	36	1
2001		260	1400	1750	3300	4300	1070	39	2
2000		190	1800	1910	2900	4600	1040	40	2
1999		33	1700	2030	4100	6200	1420	39	2
1998		240	1400	1790	3600	4900	1280	42	2
1997		390	2100	2130	3500	4800	1150	34	2
1996		310	1700	1690	3700	5700	1300	36	2
1995		220	2100	2390	4600	5200	1540	30	2
1994		450	2200	*	4000	4400	1130	25	2
1993		*	*	*	*	*	*	0	*
1992		*	*	*	*	*	*	0	*
1991		*	*	*	*	*	*	0	*
1990		*	*	*	*	*	*	0	*
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.