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	Annual Toxics Summary Riverside-Rubidoux FAQs Iron nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2023		141	1500	*	2100	3170	717	17	69.4
2022		122	1600	*	2800	3940	895	27	69.4
2021		209	1900	*	2700	4220	1010	21	69.4
2020		840	*	*	*	2450	638	6	69.4
2019		136	1400	1520	3000	4750	1160	29	69.4
2018		34.7	1400	1730	3100	3620	1020	30	69.4
2017		160	1400	1630	2800	3970	870	29	69.4
2016		376	1900	2050	3400	5380	1100	28	69.4
2015		213	1200	*	2400	4070	863	28	69.4
2014		190	1900	1870	2700	2900	747	29	55
2013		280	1700	*	2700	5300	1080	29	30
2012		170	1200	1200	2100	2300	712	30	30
2011		15	790	930	1900	1900	631	31	30
2010		64	1100	*	1300	1800	438	28	30
2009		490	1200	1180	1900	2100	498	31	30
2008		260	2200	2330	3700	5600	1200	30	1
2007		380	1500	*	3000	3700	952	23	30
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		310	*	*	*	2400	890	5	1
2002		540	2900	2940	4500	5600	1380	31	1
2001		56	2600	2520	4400	6000	1490	30	2
2000		250	2000	2310	3800	5100	1240	29	2
1999		290	2700	2350	4000	5700	1360	28	2
1998		820	2400	*	3500	3700	900	12	2
1997		500	*	*	*	500	1140	1	2
1996		160	2100	2000	3400	3800	1140	27	2
1995		140	2000	2340	4400	5300	1550	30	2
1994		260	2400	2540	4100	5100	1250	30	2
1993		66	2600	2590	4800	5900	1760	28	2
1992		160	2600	2430	4300	5400	1570	30	2
1991		20	2200	2760	5100	7400	1940	30	2
1990		650	2400	*	4600	7700	1740	15	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.