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
San Francisco-Arkansas Street FAQs
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 19 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 23 0.01
2020
0.005 * * * 0.005 0.000 9 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 0.007 0.005 0.09 0.015 31 0.01
2015
0.005 0.005 0.006 0.005 0.03 0.004 30 0.01
2014
0.005 0.005 0.005 0.005 0.005 0.000 28 0.01
2013
0.005 0.005 0.005 0.005 0.01 0.001 31 0.01
2012
0.005 0.005 0.006 0.005 0.02 0.003 29 0.01
2011
0.005 0.005 0.007 0.01 0.02 0.004 31 0.01
2010
0.005 0.01 0.009 0.01 0.02 0.004 29 0.01
2009
0.005 0.01 0.010 0.01 0.02 0.003 28 0.01
2008
0.005 0.01 0.010 0.01 0.02 0.003 31 0.01
2007
0.01 0.01 0.014 0.02 0.02 0.005 29 0.01
2006
0.01 0.02 0.019 0.02 0.02 0.003 30 0.01
2005
0.02 0.02 0.021 0.02 0.03 0.002 31 0.01
2004
0.02 0.03 0.027 0.04 0.04 0.007 30 0.01
2003
0.02 0.03 0.034 0.04 0.05 0.007 31 0.01
2002
0.03 0.04 * 0.05 0.06 0.007 16 0.01
2001
0.03 0.04 0.040 0.05 0.06 0.006 30 0.01
2000
0.04 0.05 0.063 0.11 0.12 0.025 28 0.01
1999
0.05 0.07 * 0.07 0.09 0.011 11 0.01
1998
0.03 0.06 * 0.07 0.12 0.018 27 0.01
1997
0.05 0.07 0.075 0.10 0.13 0.022 29 0.01
1996
0.06 0.10 0.109 0.18 0.25 0.049 31 0.01
1995
0.10 0.17 0.191 0.28 0.73 0.125 29 0.01
1994
0.06 0.19 0.256 0.46 1.2 0.225 30 0.01
1993
0.16 0.29 * 0.73 0.91 0.219 26 0.01
1992
0.22 0.44 0.606 1.1 2.5 0.447 31 0.01
1991
0.26 0.70 1.13 1.85 5.9 1.13 26 0.01
1990
0.23 0.53 * 1.98 2.7 0.725 27 0.01
1989
0.14 0.65 1.32 2.34 5.2 1.19 20 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.