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	Annual Toxics Summary Chico-Manzanita Avenue FAQs Zinc nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2023		*	*	*	*	*	*	0	*
2022		*	*	*	*	*	*	0	*
2021		*	*	*	*	*	*	0	*
2020		*	*	*	*	*	*	0	*
2019		*	*	*	*	*	*	0	*
2018		*	*	*	*	*	*	0	*
2017		*	*	*	*	*	*	0	*
2016		*	*	*	*	*	*	0	*
2015		*	*	*	*	*	*	0	*
2014		*	*	*	*	*	*	0	*
2013		*	*	*	*	*	*	0	*
2012		12	*	*	*	60	16.0	7	9
2011		4.5	23	*	49	92	19.1	26	9
2010		18	23	*	44	47	10.0	13	9
2009		4.5	23	*	51	100	19.1	27	9
2008		*	*	*	*	*	*	0	*
2007		13	32	*	41	58	11.0	22	3
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		21	*	*	*	82	24.8	5	1
2002		7	25	30.6	53	65	15.4	31	1
2001		1	18	21.4	37	64	13.5	32	2
2000		5	19	21.2	30	58	12.6	31	2
1999		6	26	26.3	41	59	11.3	30	2
1998		5	19	19.8	28	71	12.8	32	2
1997		6	19	21.1	38	58	12.4	30	2
1996		5	22	26.1	44	69	15.1	29	2
1995		5	21	22.7	35	52	10.3	29	2
1994		6	23	26.0	42	67	13.0	30	2
1993		4	22	27.5	53	64	16.7	29	2
1992		5	24	*	38	41	12.2	16	2
1991		*	*	*	*	*	*	0	*
1990		*	*	*	*	*	*	0	*
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.