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Methyl Chloroform
parts per billion
Year Months
Present
Minimum Median Mean 90th
Percentile
Maximum Standard
Deviation
Number of
Observations
Detection
Limit
2023
* * * * * * 0 *
2022
* * * * * * 0 *
2021
* * * * * * 0 *
2020
* * * * * * 0 *
2019
* * * * * * 0 *
2018
* * * * * * 0 *
2017
* * * * * * 0 *
2016
* * * * * * 0 *
2015
* * * * * * 0 *
2014
* * * * * * 0 *
2013
* * * * * * 0 *
2012
0.005 0.005 * 0.005 0.01 0.001 12 0.01
2011
0.005 0.005 0.024 0.01 0.61 0.110 30 0.01
2010
0.005 0.01 0.008 0.01 0.02 0.003 30 0.01
2009
0.005 0.01 0.010 0.01 0.02 0.004 31 0.01
2008
0.005 0.01 0.013 0.02 0.04 0.007 31 0.01
2007
0.01 0.02 0.017 0.02 0.02 0.004 29 0.01
2006
0.01 0.02 0.020 0.02 0.02 0.002 30 0.01
2005
0.02 0.02 0.021 0.02 0.04 0.004 31 0.01
2004
0.02 0.03 0.026 0.03 0.03 0.005 30 0.01
2003
0.03 0.03 0.034 0.04 0.04 0.005 31 0.01
2002
0.03 0.04 0.041 0.04 0.07 0.006 30 0.01
2001
0.03 0.04 0.043 0.05 0.07 0.008 31 0.01
2000
0.04 0.05 * 0.10 0.14 0.028 24 0.01
1999
0.05 0.05 * 0.06 0.06 0.005 11 0.01
1998
0.03 0.04 * 0.06 0.09 0.014 26 0.01
1997
0.05 0.08 * 0.22 0.71 0.150 28 0.01
1996
0.06 0.08 0.090 0.12 0.18 0.028 31 0.01
1995
0.08 0.13 0.181 0.21 1.1 0.192 30 0.01
1994
0.05 0.11 0.232 0.27 1.5 0.325 31 0.01
1993
0.12 0.18 0.203 0.28 0.42 0.067 30 0.01
1992
0.02 0.27 * 0.44 0.65 0.139 16 0.01
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.