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Annual Statewide Toxics Summary		 ARB's ADAM Air Quality Database
Methyl Chloroform FAQs
parts per billion
Year Months
Present		 Minimum Median Mean 90th
Percentile		 Maximum Standard
Deviation		 Number of
Observations		 Detection
Limit
2024
0.005 0.005 * 0.005 0.005 0.000 163 0.01
2023
0.005 0.005 0.005 0.005 0.005 0.000 324 0.01
2022
0.005 0.005 0.005 0.005 0.005 0.000 370 0.01
2021
0.005 0.005 * 0.005 0.005 0.000 314 0.01
2020
0.005 0.005 * 0.005 0.03 0.003 106 0.01
2019
0.005 0.005 0.006 0.005 0.05 0.004 400 0.01
2018
0.005 0.005 0.007 0.005 0.16 0.011 392 0.01
2017
0.005 0.005 0.009 0.005 0.26 0.016 387 0.01
2016
0.005 0.005 0.010 0.02 0.28 0.018 429 0.01
2015
0.005 0.005 0.009 0.02 0.20 0.013 412 0.01
2014
0.005 0.005 0.132 0.01 9.7 0.945 362 0.01
2013
0.005 0.005 0.387 0.01 9.2 1.54 469 0.01
2012
0.005 0.005 0.309 0.01 9.3 1.22 467 0.01
2011
0.005 0.005 0.304 0.02 7.4 1.26 490 0.01
2010
0.005 0.01 0.098 0.02 7.7 0.643 473 0.01
2009
0.005 0.01 0.025 0.02 0.37 0.049 522 0.01
2008
0.005 0.01 0.021 0.03 0.30 0.029 518 0.01
2007
0.01 0.02 0.024 0.03 0.31 0.029 495 0.01
2006
0.01 0.02 0.029 0.03 0.35 0.034 504 0.01
2005
0.02 0.02 0.025 0.03 0.21 0.012 510 0.01
2004
0.005 0.03 0.032 0.04 0.35 0.018 497 0.01
2003
0.02 0.04 0.048 0.05 1.2 0.085 503 0.01
2002
0.03 0.04 0.048 0.06 0.30 0.018 459 0.01
2001
0.02 0.05 0.056 0.08 0.59 0.035 499 0.01
2000
0.005 0.07 0.119 0.13 15 0.673 495 0.01
1999
0.04 0.07 * 0.16 1.6 0.135 271 0.01
1998
0.03 0.06 0.088 0.15 0.80 0.091 498 0.01
1997
0.005 0.10 0.314 0.80 7.2 0.633 557 0.01
1996
0.05 0.12 0.301 0.53 10 0.644 626 0.01
1995
0.07 0.22 0.482 1.3 7.2 0.674 616 0.01
1994
0.05 0.29 0.740 1.61 16 1.29 610 0.01
1993
0.12 0.44 1.38 3.0 45 3.43 586 0.01
1992
0.02 0.64 1.28 3.13 20 1.80 598 0.01
1991
0.19 0.85 1.71 4.1 18 2.29 574 0.01
1990
0.08 0.80 1.71 3.8 23 2.65 577 0.01
1989
0.09 0.86 1.94 4.8 31 3.02 397 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.