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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
0.005 0.005 * 0.005 0.005 0.000 16 0.01
2021
0.005 0.005 * 0.005 0.005 0.000 23 0.01
2020
0.005 * * * 0.005 0.000 9 0.01
2019
0.005 0.005 0.005 0.005 0.005 0.000 30 0.01
2018
0.005 0.005 0.005 0.005 0.005 0.000 31 0.01
2017
0.005 0.005 0.005 0.005 0.005 0.000 29 0.01
2016
0.005 0.005 0.009 0.01 0.09 0.017 31 0.01
2015
0.005 0.005 0.005 0.005 0.005 0.000 28 0.01
2014
0.005 0.005 * 0.005 0.005 0.000 25 0.01
2013
0.005 0.005 * 0.005 0.01 0.002 26 0.01
2012
0.005 0.005 * 0.005 0.005 0.000 20 0.01
2011
0.005 0.005 0.007 0.01 0.01 0.003 31 0.01
2010
0.005 0.01 0.010 0.01 0.02 0.004 30 0.01
2009
0.005 0.01 0.011 0.01 0.02 0.003 31 0.01
2008
0.01 0.01 0.012 0.02 0.02 0.004 32 0.01
2007
0.01 0.02 0.016 0.02 0.02 0.005 31 0.01
2006
0.01 0.02 0.020 0.02 0.03 0.003 31 0.01
2005
0.02 0.02 0.022 0.02 0.04 0.004 30 0.01
2004
0.02 0.03 0.029 0.03 0.04 0.006 30 0.01
2003
0.03 0.04 0.080 0.17 0.78 0.144 31 0.01
2002
0.04 0.05 0.050 0.06 0.07 0.008 27 0.01
2001
0.04 0.05 0.056 0.06 0.13 0.017 27 0.01
2000
0.05 0.10 0.748 0.20 15 2.76 29 0.01
1999
0.07 * * * 0.16 0.031 9 0.01
1998
0.04 0.09 * 0.12 0.16 0.032 16 0.01
1997
0.05 0.10 0.128 0.23 0.36 0.069 29 0.01
1996
0.06 0.19 0.198 0.32 0.36 0.074 30 0.01
1995
0.11 0.32 0.607 0.65 3.0 0.758 31 0.01
1994
0.11 0.44 0.614 1.04 4.4 0.812 29 0.01
1993
0.15 0.42 0.475 0.81 0.92 0.227 27 0.01
1992
0.17 0.77 1.10 1.64 5.9 1.06 29 0.01
1991
0.38 1.45 1.98 3.41 9.0 1.75 28 0.01
1990
0.22 1.2 1.63 3.86 4.4 1.28 28 0.01
1989
0.13 1.2 * 5.14 11 2.83 19 0.01
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.