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	Annual Toxics Summary San Francisco-Arkansas Street FAQs Potassium 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		210	*	*	*	360	54.2	6	5
2002		59	270	299	510	760	169	30	5
2001		87	230	289	580	620	171	31	3
2000		81	290	*	490	630	155	19	3
1999		52	200	*	400	560	120	20	3
1998		120	250	251	370	450	87.0	26	3
1997		120	280	289	450	590	123	28	3
1996		110	230	291	450	510	131	26	3
1995		79	230	260	430	530	131	30	3
1994		99	230	299	460	1000	180	30	3
1993		79	270	289	430	690	143	27	3
1992		120	240	*	370	400	87.9	16	3
1991		77	240	*	420	860	184	25	3
1990		74	250	*	550	560	173	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.