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California Air Resources Board

Annual Statewide Toxics Summary		 ARB's ADAM Air Quality Database
Methyl Chloroform
parts per billion
Year Months
Present		 Minimum Median Mean 90th
Percentile		 Maximum Standard
Deviation		 Number of
Observations		 Detection
Limit
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.
Risks shown only for those substances with unit risk factors.