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	Annual Toxics Summary Chico-Manzanita Avenue FAQs Aluminum 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		*	*	*	*	*	*	0	*
2011		*	*	*	*	*	*	0	*
2010		*	*	*	*	*	*	0	*
2009		*	*	*	*	*	*	0	*
2008		*	*	*	*	*	*	0	*
2007		*	*	*	*	*	*	0	*
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		160	*	*	*	820	257	5	4
2002		110	1700	1730	3100	3500	1040	31	4
2001		65	1000	1530	3500	4700	1360	32	5
2000		36	1000	1400	3200	3600	1130	31	5
1999		100	1300	1790	3900	6100	1570	30	5
1998		68	570	1270	3400	5500	1400	32	5
1997		31	990	1270	2400	4400	1010	30	5
1996		42	950	1420	3000	4600	1270	29	5
1995		38	1400	1550	3200	3700	1240	29	5
1994		58	1400	1750	4000	5700	1530	30	5
1993		62	1500	1560	3700	7300	1670	29	5
1992		63	1600	*	5700	6000	2110	16	5
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.