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

Read About Estimated Risk

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit	Estimated Risk
2023		0.025	0.09	*	0.25	0.35	0.086	21	0.05	*
2022		0.025	0.09	0.145	0.36	0.48	0.132	30	0.05	38
2021		0.025	0.08	*	0.25	0.47	0.108	24	0.05	*
2020		0.12	*	*	*	0.26	0.048	7	0.05	*
2019		0.025	0.11	0.131	0.27	0.38	0.087	30	0.05	34
2018		0.06	0.13	0.333	0.43	3.4	0.605	30	0.05	87
2017		0.05	0.13	*	0.23	0.70	0.138	20	0.05	*
2016		0.06	0.15	0.192	0.34	0.61	0.144	31	0.05	50
2015		0.06	0.17	0.229	0.45	1.0	0.196	30	0.05	60
2014		0.025	0.14	0.187	0.31	0.65	0.131	30	0.05	49
2013		0.05	0.18	0.265	0.80	1.0	0.277	31	0.05	69
2012		0.07	0.15	*	0.30	0.54	0.115	18	0.05	*
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.