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	Annual Toxics Summary Chico-East Avenue FAQs Hexavalent Chromium nanograms per cubic meter

Read About Estimated Risk

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit	Estimated Risk
2024		0.0215	*	*	*	0.0215	0.009	1	0.043	*
2023		0.0215	0.0215	0.025	0.0215	0.05	0.009	32	0.043	10
2022		0.0215	0.0215	0.053	0.07	0.62	0.108	30	0.043	22
2021		0.0215	0.0215	*	0.07	0.11	0.025	23	0.043	*
2020		0.0215	*	*	*	0.0215	0.000	7	0.043	*
2019		0.0215	0.0215	0.024	0.0215	0.0215	0.004	28	0.043	10
2018		0.03	0.01	*	0.05	0.08	0.018	22	0.02	*
2017		0.03	0.03	*	0.03	0.17	0.035	23	0.06	*
2016		0.03	*	0.030	*	0.03	*	28	0.06	12
2015		0.03	*	0.030	*	0.03	*	28	0.06	12
2014		0.03	*	0.038	*	0.06	*	28	0.06	16
2013		0.03	*	0.030	*	0.03	*	28	0.06	12
2012		0.03	*	*	*	0.03	*	14	0.06	*
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	*	*

2002 and later data based on quarterly composites; percentiles and standard deviation cannot be determined.
	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.