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Annual Statewide Toxics Summary
ARB's ADAM Air Quality Database
Hexavalent Chromium FAQs
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 0.0215 * 0.07 0.3 0.029 211 0.043 *
2022
0.0215 0.05 0.096 0.11 13 0.673 397 0.043 40
2021
0.0215 0.0215 * 0.1 0.67 0.053 314 0.043 *
2020
0.0215 0.0215 * 0.07 0.17 0.027 106 0.043 *
2019
0.0215 0.0215 0.039 0.07 0.81 0.054 395 0.043 16
2018
0.01 0.03 0.04 0.08 0.36 0.038 289 0.02 16
2017
0.03 0.03 0.065 0.15 0.45 0.064 356 0.06 27
2016
0.03 * 0.051 * 0.12 * 54 0.06 21
2015
0.03 * 0.072 * 0.24 * 56 0.06 30
2014
0.03 * 0.049 * 0.15 * 53 0.06 20
2013
0.03 * 0.052 * 0.17 * 62 0.06 22
2012
0.03 * 0.04 * 0.14 * 64 0.06 17
2011
0.03 * 0.043 * 0.17 * 61 0.06 18
2010
0.03 * 0.046 * 0.19 * 58 0.06 19
2009
0.03 * 0.045 * 0.13 * 66 0.06 19
2008
0.03 * 0.059 * 0.3 * 68 0.06 25
2007
0.03 * 0.069 * 0.47 * 68 0.06 29
2006
0.03 * 0.079 * 0.45 * 66 0.06 33
2005
0.03 * 0.091 * 0.71 * 65 0.06 38
2004
0.03 * 0.088 * 0.65 * 62 0.06 37
2003
0.03 * 0.094 * 0.86 * 66 0.06 39
2002
0.03 * 0.101 * 0.55 * 62 0.06 42
2001
0.1 0.1 0.13 0.2 1.1 0.12 456 0.2 53
2000
0.1 0.1 0.13 0.1 1.2 0.12 525 0.2 54
1999
0.1 0.1 0.11 0.1 0.8 0.06 610 0.2 46
1998
0.1 0.1 0.11 0.1 0.9 0.06 592 0.2 46
1997
0.1 0.1 0.12 0.2 0.9 0.07 567 0.2 50
1996
0.1 0.1 0.13 0.2 0.5 0.07 615 0.2 56
1995
0.1 0.2 0.29 0.4 22 0.88 636 0.2 119
1994
0.1 0.2 0.21 0.3 2.8 0.17 608 0.2 86
1993
0.1 0.2 0.22 0.4 1.2 0.15 596 0.2 90
1992
0.1 0.2 0.27 0.4 3.0 0.20 552 0.2 111
1991
0.1 0.3 * 0.6 9.9 0.52 407 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.