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	Annual Toxics Summary San Francisco-Arkansas Street FAQs Aluminum 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		530	*	*	*	1400	314	6	4
2002		2	540	768	1600	2900	673	30	4
2001		130	570	856	2000	2400	660	31	5
2000		240	730	*	1700	1800	558	19	5
1999		180	580	*	1000	1000	252	20	5
1998		160	450	491	790	1200	249	26	5
1997		88	400	559	1200	2400	504	28	5
1996		32	370	612	1200	2100	498	26	5
1995		49	540	605	1300	2000	528	30	5
1994		57	430	584	1400	2600	547	30	5
1993		90	410	739	1400	2600	602	27	5
1992		140	370	*	760	1000	248	16	5
1991		170	500	*	1100	3900	819	25	5
1990		170	600	*	1200	1800	466	14	5
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.