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	Annual Toxics Summary Chico-East Avenue FAQs Acetone parts per billion

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2023		1.3	4.2	*	6.5	9.0	1.93	13	1.0
2022		*	*	*	*	*	*	0	*
2021		3.9	*	*	*	3.9	0.72	1	1.0
2020		1.8	*	*	*	3.6	0.72	7	1.0
2019		1.5	3.5	3.81	5.8	15	2.53	30	1.0
2018		1.3	3.6	4.09	6.5	9.2	1.86	29	1.0
2017		1.8	4.8	*	11.1	12	3.32	20	1.0
2016		1.5	4.5	*	9.0	13	2.84	28	1.0
2015		2.6	5.1	6.23	11	14	3.06	30	1.0
2014		2.1	5.8	5.72	7.6	11	2.11	29	1.0
2013		2.0	4.8	5.50	8.0	16	2.77	31	1.0
2012		2.3	6.0	*	8.2	9.5	2.23	17	1.0
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.