California Home	ARB:	Home	Search	Site Map				Contact Us

	Annual Toxics Summary Riverside-Rubidoux 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
2023		0.0215	0.05	*	0.09	0.11	0.029	16	0.043	*
2022		0.0215	0.06	0.076	0.1	0.48	0.081	30	0.043	32
2021		0.0215	0.05	*	0.11	0.14	0.037	21	0.043	*
2020		0.0215	*	*	*	0.07	0.019	6	0.043	*
2019		0.0215	0.0215	0.032	0.08	0.1	0.023	28	0.043	13
2018		0.03	0.01	*	0.07	0.11	0.027	21	0.02	*
2017		0.03	0.03	0.039	0.07	0.08	0.017	30	0.06	16
2016		0.03	*	0.045	*	0.06	*	27	0.06	19
2015		0.03	*	0.083	*	0.13	*	27	0.06	34
2014		0.03	*	0.04	*	0.07	*	28	0.06	17
2013		0.03	*	0.058	*	0.09	*	27	0.06	24
2012		0.03	*	0.03	*	0.03	*	28	0.06	12
2011		0.03	*	0.03	*	0.03	*	28	0.06	12
2010		0.03	*	0.04	*	0.07	*	28	0.06	17
2009		0.06	*	0.083	*	0.13	*	28	0.06	34
2008		0.09	*	0.155	*	0.3	*	28	0.06	64
2007		0.03	*	0.23	*	0.4	*	27	0.06	96
2006		0.1	*	*	*	0.45	*	20	0.06	*
2005		0.13	*	*	*	0.71	*	21	0.06	*
2004		0.65	*	*	*	0.65	*	7	0.06	*
2003		0.12	*	0.348	*	0.86	*	28	0.06	144
2002		0.19	*	0.41	*	0.55	*	28	0.06	170
2001		0.1	0.3	*	0.9	1.1	0.32	27	0.2	*
2000		0.1	0.1	0.35	1.0	1.2	0.34	30	0.2	144
1999		0.1	0.1	0.19	0.4	0.8	0.18	31	0.2	80
1998		0.1	0.1	*	0.3	0.4	0.11	15	0.2	*
1997		0.3	*	*	*	0.3	0.14	1	0.2	*
1996		0.1	0.1	0.22	0.4	0.5	0.14	29	0.2	91
1995		0.1	0.3	0.38	0.6	0.9	0.20	30	0.2	156
1994		0.1	0.3	0.36	0.6	0.9	0.24	29	0.2	151
1993		0.1	0.3	0.33	0.5	1.2	0.23	30	0.2	138
1992		0.1	0.3	0.33	0.6	0.8	0.19	30	0.2	139
1991		0.1	0.4	*	0.5	0.7	0.16	20	0.2	*
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.