Sites with methyl chloroform data available Available Substances Toxics Statistics Home Page Data Descriptions Page
California Home ARB: Home Search Site Map Contact Us
California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
Los Angeles-North Main Street FAQs
Methyl Chloroform
parts per billion
Year Months
Present		 Minimum Median Mean 90th
Percentile		 Maximum Standard
Deviation		 Number of
Observations		 Detection
Limit
2025
* * * * * * 0 *
2024
* * * * * * 0 *
2023
* * * * * * 0 *
2022
0.005 0.005 * 0.005 0.005 0.000 11 0.01
2021
0.005 0.005 * 0.005 0.005 0.000 22 0.01
2020
0.005 * * * 0.005 0.000 5 0.01
2019
0.005 0.005 * 0.005 0.005 0.000 20 0.01
2018
0.005 0.005 * 0.005 0.005 0.000 20 0.01
2017
0.005 0.005 0.008 0.01 0.05 0.008 29 0.01
2016
0.005 0.005 0.005 0.005 0.01 0.002 31 0.01
2015
0.005 0.005 0.007 0.005 0.04 0.007 26 0.01
2014
0.005 0.005 * 0.01 0.03 0.005 21 0.01
2013
0.005 0.005 0.006 0.01 0.02 0.002 31 0.01
2012
0.005 0.005 0.007 0.01 0.01 0.003 29 0.01
2011
0.005 0.01 0.009 0.02 0.02 0.004 31 0.01
2010
0.005 0.01 0.011 0.02 0.02 0.005 29 0.01
2009
0.01 0.01 0.016 0.02 0.05 0.009 29 0.01
2008
0.01 0.02 0.019 0.02 0.05 0.008 29 0.01
2007
0.01 0.02 0.019 0.02 0.03 0.005 23 0.01
2006
0.02 0.02 * 0.02 0.03 0.002 25 0.01
2005
0.02 0.03 0.028 0.04 0.05 0.009 30 0.01
2004
0.03 0.04 0.052 0.08 0.35 0.066 24 0.01
2003
0.04 0.04 0.047 0.05 0.09 0.010 29 0.01
2002
0.04 0.06 * 0.07 0.08 0.012 23 0.01
2001
0.05 0.07 0.076 0.10 0.19 0.034 28 0.01
2000
0.06 0.09 0.108 0.16 0.26 0.051 29 0.01
1999
0.07 0.12 * 0.20 0.23 0.050 12 0.01
1998
0.04 0.10 0.172 0.38 0.80 0.170 28 0.01
1997
0.17 0.55 * 0.99 1.4 0.319 22 0.01
1996
0.19 0.50 0.676 1.22 3.0 0.583 28 0.01
1995
0.19 1.4 1.30 2.0 3.5 0.677 31 0.01
1994
0.19 1.25 1.58 3.41 5.4 1.29 30 0.01
1993
0.33 1.9 2.84 4.85 7.5 1.85 26 0.01
1992
1.1 3.1 3.40 4.9 9.9 1.75 31 0.01
1991
0.58 3.5 3.87 7.56 10 2.51 27 0.01
1990
1.3 2.6 3.32 6.48 9.7 2.07 29 0.01
1989
0.88 4.1 * 12.4 16 4.59 17 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.