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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
Richmond-13th 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    
2001
            0    
2000
            0    
1999
            0    
1998
            0    
1997
0.08       0.11 0.010 6 0.02  
1996
0.06 0.08 0.078 0.08 0.11 0.009 31 0.02 21
1995
0.06 0.10 0.097 0.11 0.12 0.013 30 0.02 25
1994
0.06 0.11   0.12 0.13 0.020 23 0.02  
1993
0.09 0.11 0.110 0.13 0.15 0.014 26 0.02 29
1992
0.11 0.11   0.13 0.14 0.009 20 0.02  
1991
0.10 0.12 0.123 0.14 0.18 0.017 29 0.02 33
1990
0.10 0.13   0.13 0.14 0.009 27 0.02  
1989
0.08 0.11   0.14 0.15 0.015 24 0.02  
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.