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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
0.005 0.005 * 0.005 0.005 0.000 21 0.01
2022
0.005 0.005 0.005 0.005 0.005 0.000 30 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 30 0.01
2017
0.005 0.005 * 0.005 0.005 0.000 20 0.01
2016
0.005 0.005 0.007 0.005 0.03 0.006 31 0.01
2015
0.005 0.005 0.007 0.01 0.03 0.006 30 0.01
2014
0.005 0.005 0.006 0.005 0.03 0.005 28 0.01
2013
0.005 0.005 0.005 0.005 0.01 0.001 31 0.01
2012
0.005 0.005 * 0.005 0.005 0.000 18 0.01
2011
* * * * * * 0 *
2010
* * * * * * 0 *
2009
* * * * * * 0 *
2008
* * * * * * 0 *
2007
* * * * * * 0 *
2006
* * * * * * 0 *
2005
* * * * * * 0 *
2004
* * * * * * 0 *
2003
* * * * * * 0 *
2002
* * * * * * 0 *
2001
* * * * * * 0 *
2000
* * * * * * 0 *
1999
* * * * * * 0 *
1998
* * * * * * 0 *
1997
* * * * * * 0 *
1996
* * * * * * 0 *
1995
* * * * * * 0 *
1994
* * * * * * 0 *
1993
* * * * * * 0 *
1992
* * * * * * 0 *
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.