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	Annual Toxics Summary Chico-Manzanita 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
2025		*	*	*	*	*	*	0	*	*
2024		*	*	*	*	*	*	0	*	*
2023		*	*	*	*	*	*	0	*	*
2022		*	*	*	*	*	*	0	*	*
2021		*	*	*	*	*	*	0	*	*
2020		*	*	*	*	*	*	0	*	*
2019		*	*	*	*	*	*	0	*	*
2018		*	*	*	*	*	*	0	*	*
2017		*	*	*	*	*	*	0	*	*
2016		*	*	*	*	*	*	0	*	*
2015		*	*	*	*	*	*	0	*	*
2014		*	*	*	*	*	*	0	*	*
2013		*	*	*	*	*	*	0	*	*
2012		0.09	0.22	*	0.65	1.2	0.314	12	0.05	*
2011		0.09	0.2	0.335	0.8	1.3	0.34	30	0.05	87
2010		0.08	0.23	0.288	0.55	1.0	0.203	30	0.05	75
2009		0.08	0.23	0.313	0.71	1.2	0.273	31	0.05	82
2008		0.09	0.23	0.399	0.9	1.2	0.314	31	0.05	104
2007		0.07	0.22	0.284	0.75	1.1	0.257	29	0.05	74
2006		0.1	0.23	0.297	0.58	0.87	0.207	30	0.05	77
2005		0.09	0.27	0.427	1.0	2.1	0.429	31	0.05	111
2004		0.1	0.34	0.533	1.3	1.6	0.465	30	0.05	139
2003		0.13	0.33	0.449	1.0	1.4	0.343	31	0.05	117
2002		0.14	0.39	0.544	1.13	1.6	0.412	30	0.05	142
2001		0.16	0.33	0.499	0.9	2.7	0.489	31	0.05	130
2000		0.1	0.3	0.52	1.1	2.4	0.53	30	0.2	135
1999		0.2	0.5	0.64	1.3	1.9	0.45	30	0.2	165
1998		0.1	0.5	0.55	1.2	1.8	0.43	31	0.2	143
1997		0.1	0.5	*	1.4	2.0	0.51	29	0.2	*
1996		0.25	0.25	0.67	1.7	2.8	0.72	31	0.5	175
1995		0.25	1.0	0.85	1.8	2.7	0.71	30	0.5	220
1994		0.25	1.2	1.14	1.9	3.0	0.74	31	0.5	298
1993		0.25	0.9	1.10	2.4	2.8	0.79	30	0.5	285
1992		0.25	1.4	*	1.9	2.6	0.64	16	0.5	*
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.