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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 22 0.01
2021
0.005 0.005 * 0.005 0.005 0.000 24 0.01
2020
0.005 * * * 0.005 0.000 7 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 0.015 0.05 0.09 0.019 31 0.01
2015
0.005 0.005 0.011 0.03 0.03 0.010 30 0.01
2014
0.005 0.005 * 0.01 0.02 0.004 27 0.01
2013
0.005 0.005 0.006 0.01 0.01 0.002 31 0.01
2012
0.005 0.005 0.006 0.01 0.01 0.002 30 0.01
2011
0.005 0.005 0.007 0.01 0.01 0.003 30 0.01
2010
0.005 0.01 0.011 0.01 0.02 0.002 24 0.01
2009
0.01 0.01 0.012 0.02 0.02 0.004 31 0.01
2008
0.01 0.02 * 0.02 0.03 0.006 28 0.01
2007
0.01 0.02 0.029 0.02 0.28 0.052 27 0.01
2006
0.02 0.02 0.022 0.02 0.04 0.004 29 0.01
2005
0.02 0.02 0.027 0.03 0.10 0.015 29 0.01
2004
0.02 0.03 0.031 0.04 0.05 0.006 28 0.01
2003
0.03 0.04 0.041 0.05 0.07 0.009 28 0.01
2002
0.04 0.05 0.053 0.06 0.07 0.008 28 0.01
2001
0.04 0.07 * 0.09 0.13 0.020 26 0.01
2000
0.05 0.08 0.102 0.17 0.37 0.066 30 0.01
1999
0.07 * * * 0.07 1.43 1 0.01
1998
* * * * * * 0 *
1997
* * * * * * 0 *
1996
* * * * * * 0 *
1995
* * * * * * 0 *
1994
* * * * * * 0 *
1993
* * * * * * 0 *
1992
* * * * * * 0 *
1991
* * * * * * 0 *
1990
* * * * * * 0 *
1989
0.35 * * * 4.2 1.43 7 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.