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

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2025		*	*	*	*	*	*	0	*
2024		*	*	*	*	*	*	0	*
2023		*	*	*	*	*	*	0	*
2022		*	*	*	*	*	*	0	*
2021		*	*	*	*	*	*	0	*
2020		*	*	*	*	*	*	0	*
2019		*	*	*	*	*	*	0	*
2018		*	*	*	*	*	*	0	*
2017		*	*	*	*	*	*	0	*
2016		*	*	*	*	*	*	0	*
2015		*	*	*	*	*	*	0	*
2014		*	*	*	*	*	*	0	*
2013		*	*	*	*	*	*	0	*
2012		*	*	*	*	*	*	0	*
2011		*	*	*	*	*	*	0	*
2010		*	*	*	*	*	*	0	*
2009		*	*	*	*	*	*	0	*
2008		*	*	*	*	*	*	0	*
2007		*	*	*	*	*	*	0	*
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		680	*	*	*	1800	393	6	4
2002		200	740	910	1700	3500	684	30	4
2001		170	640	1020	2500	3700	940	31	3
2000		250	1100	*	2400	3500	945	19	3
1999		180	550	*	1100	1500	336	20	3
1998		220	560	667	1300	1700	425	26	3
1997		150	710	758	1400	2200	471	28	3
1996		85	660	888	1700	2700	621	26	3
1995		130	590	923	2200	4900	997	30	3
1994		120	560	775	1400	4300	774	30	3
1993		120	610	839	1600	2100	547	27	3
1992		240	470	*	1000	1800	405	16	3
1991		220	540	*	1100	3700	700	25	3
1990		150	700	*	1500	2100	558	14	3
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.