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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
Simi Valley-Cochran Street
Carbon Tetrachloride
parts per billion
Year Months
Present		 Minimum Median Mean 90th
Percentile		 Maximum Standard
Deviation		 Number of
Observations		 Detection
Limit		 Estimated
Risk
2002
0.08 0.09 0.090 0.10 0.11 0.008 27 0.02 24
2001
0.04 0.09 0.084 0.09 0.10 0.012 27 0.02 22
2000
0.06 0.09 0.091 0.11 0.12 0.012 29 0.02 24
1999
0.07       0.10 0.008 9 0.02  
1998
0.04 0.12   0.15 0.16 0.031 17 0.02  
1997
0.08 0.11   0.12 0.16 0.019 20 0.02  
1996
0.06 0.08 0.079 0.09 0.10 0.008 30 0.02 21
1995
0.06 0.10 0.099 0.11 0.13 0.013 31 0.02 26
1994
0.07 0.11   0.12 0.13 0.016 19 0.02  
1993
0.05 0.10   0.11 0.13 0.017 25 0.02  
1992
0.11 0.12   0.12 0.13 0.007 19 0.02  
1991
0.10 0.13 0.128 0.14 0.16 0.012 27 0.02 34
1990
0.12 0.13 0.134 0.15 0.15 0.010 29 0.02 35
1989
0.07 0.11 0.113 0.13 0.15 0.017 21 0.02 30
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.