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Benzene
parts per billion
Read About Estimated Risk
Year Months
Present
Minimum Median Mean 90th
Percentile
Maximum Standard
Deviation
Number of
Observations
Detection
Limit
Estimated
Risk
2023
0.07 0.15 * 0.26 0.37 0.078 20 0.05 *
2022
0.06 0.17 0.191 0.32 0.51 0.122 29 0.05 50
2021
0.06 0.18 * 0.39 0.55 0.125 22 0.05 *
2020
0.1 * * * 0.4 0.125 7 0.05 *
2019
0.07 0.16 * 0.26 0.55 0.119 26 0.05 *
2018
* * * * * * 0 * *
2017
0.08 0.18 * 0.4 0.55 0.129 20 0.05 *
2016
0.07 0.27 0.327 0.68 0.82 0.204 29 0.05 85
2015
0.09 0.29 * 0.57 0.62 0.16 25 0.05 *
2014
0.07 0.27 0.29 0.61 0.69 0.183 28 0.05 75
2013
0.1 0.27 0.307 0.47 1.1 0.199 31 0.05 80
2012
0.11 0.29 0.322 0.43 0.68 0.135 30 0.05 84
2011
0.1 0.23 0.282 0.47 0.8 0.176 31 0.05 73
2010
0.15 0.31 0.358 0.52 1.1 0.188 31 0.05 93
2009
0.09 0.27 * 0.7 1.1 0.246 26 0.05 *
2008
0.06 0.3 0.326 0.51 0.75 0.156 30 0.05 85
2007
0.14 0.3 0.404 0.88 1.0 0.259 30 0.05 105
2006
0.09 0.43 0.42 0.71 1.0 0.239 29 0.05 109
2005
0.13 0.34 0.505 1.1 1.4 0.347 31 0.05 131
2004
0.2 0.42 0.526 0.91 1.3 0.279 30 0.05 137
2003
0.23 0.57 0.623 1.0 1.5 0.313 30 0.05 162
2002
0.21 0.49 * 1.35 1.4 0.418 26 0.05 *
2001
0.17 0.58 0.685 1.2 1.8 0.415 31 0.05 178
2000
0.2 0.7 0.85 1.1 2.3 0.50 30 0.2 221
1999
0.1 0.7 0.87 1.9 2.4 0.63 29 0.2 225
1998
0.1 1.0 * 1.5 1.8 0.48 15 0.2 *
1997
0.6 * * * 0.6 0.56 1 0.2 *
1996
0.25 1.0 1.03 1.7 2.2 0.56 31 0.5 268
1995
0.25 1.3 1.45 2.6 3.6 0.93 31 0.5 376
1994
0.25 1.9 2.01 2.8 4.8 0.92 31 0.5 524
1993
0.25 1.7 1.77 3.1 4.1 1.05 29 0.5 461
1992
0.25 2.1 1.90 2.9 4.0 0.94 30 0.5 494
1991
0.25 2.2 2.22 3.7 4.7 1.30 29 0.5 578
1990
0.8 2.4 2.55 4.0 5.4 1.25 28 0.5 664
1989
0.8 2.8 3.01 4.5 5.1 1.20 21 0.5 782
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.