California Home	ARB:	Home	Search	Site Map				Contact Us

	Annual Toxics Summary Los Angeles-North Main Street FAQs Chromium nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2024		4.255	4.255	*	4.255	9	1.3	12	8.51
2023		4.255	4.255	*	11	13	3.3	24	8.51
2022		4.255	4.255	7.3	11	18	3.7	27	8.51
2021		4.255	4.255	*	12	16	3.6	22	8.51
2020		4.255	*	*	*	10	2.4	7	8.51
2019		4.255	4.255	*	12	19	4.0	27	8.51
2018		4.255	9	8.0	11	13	3.1	28	8.51
2017		4.255	4.255	6.0	10	13	2.8	30	8.51
2016		4.255	4.255	4.8	4.255	12	2.0	31	8.51
2015		4.255	4.255	4.8	4.255	13	1.8	30	8.51
2014		3.4	3.4	5.0	9	10	2.5	29	6.8
2013		4	4	*	7	14	2.6	25	3
2012		1.5	4	*	7	9	2.3	20	3
2011		4	5	*	7	30	7.1	13	3
2010		1.5	4	*	7	44	9.5	18	3
2009		1.5	3	3.8	6	8	2.0	30	3
2008		*	*	*	*	*	*	0	*
2007		1.5	4	*	6	8	1.2	26	3
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		3	*	*	*	8	1.8	5	2
2002		1	7	8.0	12	22	4.4	29	2
2001		1	5	*	10	11	2.8	22	2
2000		1	5	5.3	8	9	2.2	31	2
1999		1	7	6.7	9	20	3.7	30	2
1998		1	5	*	10	11	3.2	26	2
1997		1	5	*	8	20	4.2	17	2
1996		1	8	7.1	13	18	4.3	29	2
1995		1	7	6.5	11	18	3.8	28	2
1994		1	7	8.3	15	26	5.4	28	2
1993		1	8	*	11	13	3.4	23	2
1992		1	9	*	13	16	4.3	21	2
1991		1	8	7.5	12	21	4.6	28	2
1990		2	6	*	10	24	4.7	28	1
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.