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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 0.06 * 0.08 0.3 0.073 12 0.043 *
2022
0.0215 0.07 0.124 0.12 1.9 0.336 30 0.043 52
2021
0.0215 0.09 * 0.12 0.2 0.038 22 0.043 *
2020
0.0215 * * * 0.13 0.034 7 0.043 *
2019
0.0215 0.05 * 0.08 0.11 0.026 28 0.043 *
2018
0.03 0.07 0.07 0.13 0.28 0.065 19 0.02 29
2017
0.03 0.07 * 0.14 0.2 0.046 22 0.06 *
2016
0.03 * 0.07 * 0.09 * 27 0.06 29
2015
0.07 * 0.12 * 0.2 * 28 0.06 50
2014
0.06 * 0.083 * 0.13 * 27 0.06 34
2013
0.03 * 0.078 * 0.14 * 28 0.06 32
2012
0.03 * 0.055 * 0.07 * 28 0.06 23
2011
0.03 * 0.085 * 0.17 * 27 0.06 35
2010
0.06 * * * 0.1 * 14 0.06 *
2009
0.08 * 0.095 * 0.12 * 28 0.06 39
2008
0.06 * 0.098 * 0.17 * 28 0.06 41
2007
0.06 * 0.095 * 0.15 * 28 0.06 39
2006
0.03 * 0.105 * 0.16 * 28 0.06 44
2005
0.08 * 0.125 * 0.22 * 25 0.06 52
2004
0.07 * * * 0.1 * 19 0.06 *
2003
0.03 * 0.07 * 0.09 * 27 0.06 29
2002
0.11 * 0.133 * 0.16 * 27 0.06 55
2001
0.1 0.1 * 0.4 0.5 0.12 28 0.2 *
2000
0.1 0.1 0.13 0.2 0.4 0.07 31 0.2 53
1999
0.1 0.1 0.11 0.1 0.4 0.05 30 0.2 45
1998
0.1 0.1 * 0.1 0.1 0.00 22 0.2 *
1997
0.1 0.1 * 0.2 0.3 0.06 25 0.2 *
1996
0.1 0.1 0.17 0.3 0.3 0.08 30 0.2 70
1995
0.1 0.2 0.23 0.4 0.7 0.14 31 0.2 96
1994
0.1 0.3 0.27 0.4 0.6 0.12 28 0.2 110
1993
0.1 0.2 0.24 0.4 0.4 0.11 28 0.2 99
1992
0.1 0.3 * 0.6 0.7 0.16 21 0.2 *
1991
0.1 0.3 * 0.4 0.8 0.17 24 0.2 *
1990
* * * * * * 0 * *
1989
* * * * * * 0 * *
Graph It!
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.