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

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2024		6	11	*	20	25	5.6	13	0.8
2023		4	13	16.7	26	50	10.2	26	2.69
2022		1.345	12	16.8	31	57	11.8	31	2.69
2021		3	11	*	22	45	9.3	23	2.69
2020		8	*	*	*	62	21.1	9	2.69
2019		1.345	16	25.2	42	136	27.9	29	2.69
2018		1.345	24	28.3	41	93	21.0	30	2.69
2017		4	24	32.4	52	130	30.4	28	2.69
2016		4	16	20.4	48	73	16.1	30	2.69
2015		3	16	19.7	33	51	11.8	30	2.69
2014		3	14	19.2	25	120	21.7	30	1.9
2013		3	14	*	33	61	14.6	28	1.5
2012		4.5	4.5	7.4	18	24	6.2	29	9
2011		4.5	4.5	*	13	16	4.1	27	9
2010		4.5	4.5	7.7	16	37	7.8	30	9
2009		4.5	4.5	6.5	12	17	3.7	31	9
2008		9	35	43.6	84	150	33.2	31	1
2007		4.5	4.5	9.3	21	31	8.0	28	9
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		48	*	*	*	91	15.5	6	3
2002		5	48	57.5	110	210	42.3	30	3
2001		5	38	57.0	140	170	46.5	31	10
2000		17	67	*	130	180	46.4	19	10
1999		5	46	*	78	90	24.6	20	10
1998		5	40	50.1	80	310	57.1	26	10
1997		5	42	50.4	100	150	33.7	28	10
1996		5	50	67.3	130	340	66.8	26	10
1995		5	53	75.3	160	320	82.1	30	10
1994		5	42	57.8	110	240	56.3	30	10
1993		5	44	71.5	120	270	63.7	27	10
1992		11	36	*	73	99	22.8	16	10
1991		14	55	*	99	340	76.8	25	10
1990		13	60	*	120	1100	280	14	10
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.