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	Annual Toxics Summary Chico-East Avenue 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	*	34	56	13.3	20	9.98
2022		4.99	24	*	40	71	14.4	28	9.98
2021		4.99	22	*	51	61	17.0	23	9.98
2020		15	*	*	*	81	22.1	7	9.98
2019		4.99	24	28.2	50	125	26.8	29	9.98
2018		4.99	21	*	40	391	74.7	25	9.98
2017		5	24	26.5	49	56	14.2	31	10
2016		5	19	*	40	80	18.2	32	10
2015		5	29	29.5	43	53	12.1	30	10
2014		4.2	19	23.8	37	87	19.3	31	8.4
2013		7	22	*	61	77	20.9	26	5.2
2012		4.5	31	*	55	81	20.7	13	9
2011		*	*	*	*	*	*	0	*
2010		*	*	*	*	*	*	0	*
2009		*	*	*	*	*	*	0	*
2008		*	*	*	*	*	*	0	*
2007		*	*	*	*	*	*	0	*
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		*	*	*	*	*	*	0	*
2002		*	*	*	*	*	*	0	*
2001		*	*	*	*	*	*	0	*
2000		*	*	*	*	*	*	0	*
1999		*	*	*	*	*	*	0	*
1998		*	*	*	*	*	*	0	*
1997		*	*	*	*	*	*	0	*
1996		*	*	*	*	*	*	0	*
1995		*	*	*	*	*	*	0	*
1994		*	*	*	*	*	*	0	*
1993		*	*	*	*	*	*	0	*
1992		*	*	*	*	*	*	0	*
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.