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	Annual Toxics Summary Riverside-Rubidoux FAQs Chromium nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2023		4.255	4.255	*	10	11	2.4	17	8.51
2022		4.255	4.255	*	12	13	3.3	27	8.51
2021		4.255	9	*	11	13	3.1	21	8.51
2020		4.255	*	*	*	19	5.5	6	8.51
2019		4.255	4.255	*	10	16	3.1	28	8.51
2018		4.255	9	8.1	11	13	3.0	30	8.51
2017		4.255	4.255	6.7	11	13	3.1	29	8.51
2016		4.255	4.255	5.2	11	11	2.5	28	8.51
2015		4.255	4.255	*	4.255	11	1.5	28	8.51
2014		3.4	3.4	5.7	10	19	3.7	29	6.8
2013		4	4	*	6	13	2.1	29	3
2012		1.5	5	*	7	7	1.7	27	3
2011		1.5	4	*	6	8	1.7	29	3
2010		1.5	4	4.1	5	8	1.5	30	3
2009		1.5	4	3.8	6	6	1.5	31	3
2008		*	*	*	*	*	*	0	*
2007		1.5	5	*	7	10	2.4	20	3
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		1	*	*	*	6	2.6	5	2
2002		1	7	7.6	12	17	4.0	31	2
2001		1	6	6.0	12	14	4.1	30	2
2000		1	5	6.2	10	14	3.4	29	2
1999		1	6	6.2	12	17	4.2	28	2
1998		3	7	*	10	12	2.6	12	2
1997		2	*	*	*	2	3.0	1	2
1996		1	5	5.4	9	10	3.0	27	2
1995		1	6	7.4	15	18	5.2	30	2
1994		1	7	7.3	12	19	3.8	30	2
1993		1	7	7.7	13	17	5.1	28	2
1992		1	7	6.8	12	18	4.5	30	2
1991		1	6	6.7	11	21	4.9	30	2
1990		1	6	5.4	9	17	3.8	29	1
1989		1	7	6.8	13	16	3.4	53	1

	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.