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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
0.005 0.005 0.005 0.005 0.01 0.002 30 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 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 0.02 0.02 0.004 31 0.01
2008
0.01 0.01 0.014 0.02 0.03 0.006 30 0.01
2007
0.01 0.01 0.014 0.02 0.02 0.005 28 0.01
2006
0.02 0.02 0.021 0.03 0.03 0.003 32 0.01
2005
0.02 0.02 0.025 0.03 0.04 0.006 28 0.01
2004
0.005 0.03 0.027 0.03 0.04 0.006 29 0.01
2003
0.02 0.04 0.035 0.04 0.05 0.006 30 0.01
2002
0.03 0.04 0.046 0.06 0.06 0.009 29 0.01
2001
0.04 0.05 0.049 0.06 0.07 0.008 30 0.01
2000
0.05 0.06 0.074 0.10 0.16 0.026 27 0.01
1999
0.05 0.09 * 0.12 0.13 0.023 14 0.01
1998
0.03 0.06 * 0.10 0.18 0.034 20 0.01
1997
0.05 0.09 0.126 0.18 0.62 0.110 26 0.01
1996
0.06 0.14 0.280 0.39 1.3 0.268 30 0.01
1995
0.14 0.26 0.341 0.59 1.2 0.253 29 0.01
1994
0.07 0.38 * 1.16 3.1 0.619 28 0.01
1993
0.13 0.49 0.884 1.74 3.4 0.721 27 0.01
1992
0.35 0.84 1.36 2.24 11 1.99 29 0.01
1991
0.38 0.84 1.53 2.36 11 2.07 28 0.01
1990
0.24 0.85 0.935 1.6 3.8 0.690 31 0.01
1989
0.17 0.95 1.30 2.16 6.1 1.29 22 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.