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

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2023		4.99	23	*	37	57	12.9	17	9.98
2022		4.99	25	34.3	68	101	22.2	31	9.98
2021		4.99	24	*	54	82	19.2	23	9.98
2020		17	*	*	*	86	26.1	9	9.98
2019		4.99	34	41.7	80	131	31.3	29	9.98
2018		4.99	45	*	100	531	106	24	9.98
2017		5	47	57.3	97	213	42.2	28	10
2016		5	28	38.4	79	103	27.5	30	10
2015		5	29	44.8	76	233	45.4	30	10
2014		4.2	21	30.0	54	150	31.5	30	8.4
2013		2.6	29	*	73	130	30.4	23	5.2
2012		4.5	20	*	40	79	16.6	20	9
2011		4.5	24	*	45	320	72.5	17	9
2010		10	24	*	60	100	24.9	18	9
2009		12	27	*	50	62	13.8	28	9
2008		*	*	*	*	*	*	0	*
2007		15	36	*	75	120	26.8	18	3
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		51	*	*	*	88	13.5	6	1
2002		13	39	57.9	97	360	65.0	30	1
2001		16	35	47.7	100	140	32.7	31	2
2000		16	49	*	160	4800	1090	19	2
1999		4	27	*	58	76	18.3	20	2
1998		11	34	47.3	69	220	41.4	26	2
1997		17	48	52.8	86	130	28.9	28	2
1996		12	35	58.0	94	370	71.3	26	2
1995		10	41	47.9	89	120	32.6	30	2
1994		7	37	41.7	74	140	28.5	30	2
1993		6	36	48.6	85	120	27.5	27	2
1992		10	27	*	45	76	17.3	16	2
1991		7	31	*	74	140	29.5	25	2
1990		9	38	*	67	180	42.5	14	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.