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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
Fremont-Chapel Way
Carbon Tetrachloride
parts per billion
Year Months
Present		 Minimum Median Mean 90th
Percentile		 Maximum Standard
Deviation		 Number of
Observations		 Detection
Limit		 Estimated
Risk
2002
0.07 0.09 0.089 0.10 0.10 0.009 28 0.02 24
2001
0.07 0.09 0.085 0.09 0.11 0.009 30 0.02 23
2000
0.08 0.09 0.095 0.12 0.13 0.013 29 0.02 25
1999
0.08 0.08   0.12 0.12 0.015 15 0.02  
1998
0.09 0.11   0.14 0.14 0.017 29 0.02  
1997
0.08 0.10   0.11 0.13 0.013 13 0.02  
1996
0.06 0.08 0.076 0.09 0.09 0.008 31 0.02 20
1995
0.07 0.10 0.101 0.12 0.13 0.011 30 0.02 27
1994
0.06 0.12   0.13 0.13 0.018 22 0.02  
1993
0.08 0.11 0.105 0.13 0.14 0.016 26 0.02 28
1992
0.10 0.12   0.13 0.13 0.008 21 0.02  
1991
0.10 0.13 0.127 0.15 0.17 0.016 28 0.02 34
1990
0.09 0.13 0.131 0.15 0.18 0.019 29 0.02 35
1989
0.09 0.13 0.124 0.14 0.15 0.017 23 0.02 33
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.