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Annual Toxics Summary		 ARB's ADAM Air Quality Database
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Methylene Chloride
parts per billion
Read About Estimated Risk
Year Months
Present		 Minimum Median Mean 90th
Percentile		 Maximum Standard
Deviation		 Number of
Observations		 Detection
Limit		 Estimated
Risk
2025
0.1 0.21 * 0.42 7.0 1.52 20 0.1 *
2024
0.1 0.19 0.23 0.38 0.69 0.148 29 0.1 2
2023
0.05 0.21 0.857 1.46 10 1.99 30 0.1 8
2022
0.11 0.41 1.06 1.4 11 2.73 29 0.1 11
2021
0.05 0.15 * 0.62 7.2 1.50 22 0.1 *
2020
0.05 * * * 0.24 0.071 7 0.1 *
2019
0.05 0.16 * 0.62 1.4 0.318 26 0.1 *
2018
* * * * * * 0 * *
2017
0.17 1.85 * 55.1 110 32.0 20 0.1 *
2016
0.79 26.5 48.2 130 190 53.9 30 0.1 477
2015
0.05 0.81 * 3.68 7.5 1.84 25 0.1 *
2014
0.11 0.49 1.49 3.83 14 2.77 28 0.1 15
2013
0.16 0.69 1.33 3.0 8.1 1.72 31 0.1 13
2012
0.05 0.46 2.41 8.92 21 4.54 30 0.1 24
2011
0.05 0.3 1.43 1.9 15 2.80 31 0.1 14
2010
0.05 0.47 2.65 9.4 17 4.60 31 0.1 26
2009
0.05 0.15 * 0.34 0.76 0.171 27 0.1 *
2008
0.05 0.17 0.202 0.32 0.78 0.138 30 0.1 2
2007
0.05 0.17 0.193 0.28 0.5 0.085 30 0.1 2
2006
0.05 0.16 0.18 0.26 0.58 0.11 29 0.1 2
2005
0.05 0.18 0.301 0.45 3.4 0.59 31 0.1 3
2004
0.05 0.24 0.291 0.48 1.3 0.24 29 0.1 3
2003
0.05 0.32 0.447 1.07 1.8 0.484 30 0.1 4
2002
0.1 0.24 * 0.97 1.4 0.36 26 0.1 *
2001
0.5 0.27 0.437 0.75 1.0 0.247 31 0.1 4
2000
0.5 0.5 0.69 0.5 3.6 0.58 30 1.0 7
1999
0.5 0.5 0.58 0.5 1.4 0.24 26 1.0 6
1998
0.5 0.5 * 1.1 7.2 1.72 15 1.0 *
1997
0.5 * * * 0.5 0.94 1 1.0 *
1996
0.5 0.5 0.83 1.3 5.6 0.94 31 1.0 8
1995
0.5 0.5 0.98 1.8 2.1 0.58 31 1.0 10
1994
0.5 0.5 0.93 1.8 2.5 0.62 31 1.0 9
1993
0.5 0.5 1.10 2.1 3.7 0.87 29 1.0 11
1992
0.5 0.5 0.60 0.5 2.2 0.33 30 1.0 6
1991
0.5 0.5 0.69 1.3 1.9 0.42 29 1.0 7
1990
0.5 1.2 * 2.3 4.2 0.97 24 1.0 *
1989
0.5 0.5 0.91 1.8 2.3 0.57 24 1.0 9
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.