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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
Bakersfield-5558 California Avenue
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 0.092 0.11 0.11 0.012 30 0.02 24
2001
0.07 0.09 0.086 0.09 0.12 0.010 31 0.02 23
2000
0.08 0.09 0.094 0.12 0.13 0.014 30 0.02 25
1999
0.08 0.08   0.11 0.12 0.014 15 0.02  
1998
0.09 0.11   0.14 0.15 0.020 27 0.02  
1997
0.09 0.11   0.12 0.13 0.009 24 0.02  
1996
0.07 0.08 0.079 0.09 0.10 0.009 32 0.02 21
1995
0.06 0.10 0.099 0.11 0.12 0.011 32 0.02 26
1994
0.08 0.11   0.12 0.13 0.014 12 0.02  
1993
            0    
1992
            0    
1991
            0    
1990
            0    
1989
            0    
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.