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	Annual Toxics Summary Chula Vista FAQs Iron nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2024		121	350	*	710	1020	290	13	24
2023		86	500	601	1100	2060	413	31	69.4
2022		106	490	568	1100	1220	307	31	69.4
2021		156	550	*	1000	1640	350	23	69.4
2020		161	*	*	*	1160	335	8	69.4
2019		34.7	380	486	860	1790	401	30	69.4
2018		181	610	611	1000	1120	257	31	69.4
2017		34.7	450	621	1500	1580	528	30	69.4
2016		79	670	*	1500	2190	498	27	69.4
2015		34.7	420	565	1200	1540	404	30	69.4
2014		210	480	598	1100	1700	360	31	55
2013		150	400	*	900	1600	327	28	30
2012		120	280	418	750	1200	276	29	30
2011		55	280	*	590	690	204	25	30
2010		15	250	261	420	850	171	28	30
2009		95	450	493	780	1800	344	30	30
2008		170	610	763	1400	2100	512	30	1
2007		120	510	*	1100	1400	350	28	30
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		240	*	*	*	1100	394	5	1
2002		300	640	785	1400	2300	453	30	1
2001		220	640	634	980	1300	292	28	2
2000		230	510	*	950	1700	411	11	2
1999		38	640	*	870	1900	434	17	2
1998		170	540	655	1100	1200	331	27	2
1997		110	800	762	1100	2000	410	29	2
1996		130	430	516	920	1300	293	30	2
1995		74	620	618	1000	1500	319	29	2
1994		130	640	709	960	1800	356	30	2
1993		110	560	679	1100	1700	411	27	2
1992		110	540	566	1100	1300	318	28	2
1991		93	510	547	850	1100	248	29	2
1990		200	680	*	1700	1800	491	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.