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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 * 4.255 10 1.5 21 8.51
2022
4.255 4.255 4.6 4.255 9 1.4 30 8.51
2021
4.255 4.255 * 4.255 11 2.0 23 8.51
2020
4.255 * * * 16 4.2 7 8.51
2019
4.255 4.255 * 9 14 2.5 27 8.51
2018
4.255 4.255 5.4 9 11 2.1 31 8.51
2017
4.255 4.255 4.9 9 10 1.7 29 8.51
2016
4.255 4.255 4.3 4.255 4.255 0.0 31 8.51
2015
4.255 4.255 4.5 4.255 10 1.1 28 8.51
2014
3.4 3.4 4.1 8 9 1.8 30 6.8
2013
4 4 * 1.5 7 1.0 28 3
2012
1.5 4 3.7 6 7 1.5 28 3
2011
1.5 3 * 5 6 1.5 28 3
2010
1.5 1.5 * 4 6 1.2 17 3
2009
1.5 1.5 2.6 4 6 1.2 31 3
2008
* * * * * * 0 *
2007
1.5 3 * 4 5 1.1 26 3
2006
* * * * * * 0 *
2005
* * * * * * 0 *
2004
* * * * * * 0 *
2003
1 * * * 4 1.3 5 2
2002
1 3 3.0 5 8 1.9 30 2
2001
1 2 2.4 4 6 1.6 31 2
2000
1 1 2.5 5 5 1.7 28 2
1999
1 3 3.5 6 15 2.9 29 2
1998
1 2 2.6 5 8 1.9 29 2
1997
1 3 3.0 5 7 1.7 29 2
1996
1 2 2.5 5 6 1.6 31 2
1995
1 2 2.8 6 9 2.3 30 2
1994
1 3 2.9 5 7 1.8 30 2
1993
1 3 * 7 8 2.2 24 2
1992
* * * * * * 0 *
1991
* * * * * * 0 *
1990
* * * * * * 0 *
1989
* * * * * * 0 *
Graph It!
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.