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

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2023		0.15	0.15	*	0.4	0.4	0.12	13	0.3
2022		*	*	*	*	*	*	0	*
2021		0.7	*	*	*	0.7	0.32	1	0.3
2020		0.15	*	*	*	0.8	0.32	5	0.3
2019		0.15	0.3	0.39	0.7	1.5	0.29	30	0.3
2018		0.15	0.4	0.51	1.0	2.1	0.47	29	0.3
2017		0.15	0.4	*	0.5	0.7	0.16	20	0.3
2016		0.15	0.4	*	0.6	0.9	0.20	28	0.3
2015		0.15	0.4	0.46	0.9	1.4	0.34	30	0.3
2014		0.3	0.6	0.70	0.9	1.4	0.27	29	0.3
2013		0.15	0.7	0.74	1.0	2.0	0.37	29	0.3
2012		0.15	0.6	*	1.2	3.1	0.67	17	0.3
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.